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* setupexternalfigures and resoĺution
@ 2022-09-01  8:44 juh+ntg-context--- via ntg-context
  2022-09-01  8:51 ` Henning Hraban Ramm via ntg-context
  0 siblings, 1 reply; 10+ messages in thread
From: juh+ntg-context--- via ntg-context @ 2022-09-01  8:44 UTC (permalink / raw)
  To: mailing list for ConTeXt users; +Cc: juh+ntg-context


Hi,

what is resolution meant to do?

Whatever I insert as resolution, I get no change.

\setupexternalfigure[location={default,local},resolution=30]
\starttext
\externalfigure[hacker]
\stoptext

What am I missing?

TIA
juh
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^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01  8:44 setupexternalfigures and resoĺution juh+ntg-context--- via ntg-context
@ 2022-09-01  8:51 ` Henning Hraban Ramm via ntg-context
  2022-09-01  8:56   ` Henning Hraban Ramm via ntg-context
                     ` (2 more replies)
  0 siblings, 3 replies; 10+ messages in thread
From: Henning Hraban Ramm via ntg-context @ 2022-09-01  8:51 UTC (permalink / raw)
  To: juh+ntg-context--- via ntg-context; +Cc: Henning Hraban Ramm

[-- Attachment #1: Type: text/plain, Size: 653 bytes --]

Am 01.09.22 um 10:44 schrieb juh+ntg-context--- via ntg-context:
> 
> Hi,
> 
> what is resolution meant to do?
> 
> Whatever I insert as resolution, I get no change.
> 
> \setupexternalfigure[location={default,local},resolution=30]
> \starttext
> \externalfigure[hacker]
> \stoptext
> 
> What am I missing?

The resolution parameter is still not used by default ConTeXt, sorry.

But you can use it with the attached lua file like:


\loadluafile[grph-downsample]
\doifmodeelse{print}{%
	\def\Resolution{300}
}{%
	\def\Resolution{96}
}%

\setupexternalfigures[
   %directory={./Logos,img},
   conversion=lowres.jpg,
   resolution=\Resolution,
]


Hraban

[-- Attachment #2: grph-downsample.lua --]
[-- Type: text/plain, Size: 2771 bytes --]

if not modules then modules = { } end modules ['grph-downsample'] = {
  version   = 1.100,
  comment   = "companion to grph-inc.mkiv",
  author    = "Peter Münster", -- adapted to LMTX by Hraban
  copyright = "PRAGMA ADE / ConTeXt Development Team",
  license   = "see context related readme files"
}

assert(not figures.getinfo2)

figures.getinfo2 = function(name, page) -- [ [NTG-context] Pdf info with Lua/Ctx API ]
 if type(name) == "string" then
   name = { name = name, page = page }
 end

 if name.name then
   local data = figures.push(name)
   local info = figures.identify()

   if info.status.status ~= 0 then
     figures.check() -- !Counts pages here!
   end

   figures.pop()

   return --data
          info
 end
end


local format = string.format
-- figures.cachepaths.path = "cache" -- should be setup-option
local function sample_down(oldname, newname, resolution)
  print("DOWNSAMPLE sample_down " .. oldname .. " to " .. newname)
  local request = figures.current().request
  local width = request.width
  local height = request.height
  if resolution == "" then -- or (not width and not height) then
    print(format("DOWNSAMPLE Nothing to do: %s, %s, %s dpi, %s x %s px", oldname, newname, resolution, width, height))
    return
  end
  local TEXpt = 65536
  local inch = 72.27

  -- MkIV:
  -- local image = img.scan{filename = oldname}

  -- LMTX:
  local image = figures.getinfo(oldname,1)
  image = image.status.private

  local xy = image.xsize / image.ysize
  if (not width and not height) then
    -- no size requested? use default width
    width = 300 * TEXpt
  end
  if not width then
    height = height / TEXpt
    width = height * xy
  end
  if not height then
    width = width / TEXpt
    height = width / xy
  end
  width = math.floor(width)
  height = math.floor(height)
  print(format("DOWNSAMPLE image size %dx%dpx. requested %dx%d?", image.xsize, image.ysize, width, height))
  local xsize = math.floor(resolution * width / inch)
  local ysize = math.floor(resolution * height / inch)
  print(format("DOWNSAMPLE size %d x %d to %d x %d", image.xsize, image.ysize, xsize, ysize))
  if xsize < image.xsize or ysize < image.ysize then
    local s = format("gm convert -resize %dx%d -resample %dx%d %s %s",
                     xsize, ysize, resolution, resolution, oldname, newname)
    print("DOWNSAMPLE Conversion: " .. s)
    os.execute(s)
  else
    print(format("DOWNSAMPLE Nothing to do: %s, %s, %s dpi, %d x %d px", oldname, newname, resolution, width, height))
    print(format("DOWNSAMPLE xsize = %d, ysize = %d", xsize, ysize))
  end
end

local formats = {"png", "jpg", "gif"}

for _, s in ipairs(formats) do
  figures.converters[s] = figures.converters[s] or {}
  figures.converters[s]["lowres." .. s] = sample_down
end

[-- Attachment #3: Type: text/plain, Size: 496 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01  8:51 ` Henning Hraban Ramm via ntg-context
@ 2022-09-01  8:56   ` Henning Hraban Ramm via ntg-context
  2022-09-01 10:37     ` juh+ntg-context--- via ntg-context
  2022-09-01 11:43   ` juh+ntg-context--- via ntg-context
  2022-09-02  8:39   ` Keith McKay via ntg-context
  2 siblings, 1 reply; 10+ messages in thread
From: Henning Hraban Ramm via ntg-context @ 2022-09-01  8:56 UTC (permalink / raw)
  To: ntg-context; +Cc: Henning Hraban Ramm

Am 01.09.22 um 10:51 schrieb Henning Hraban Ramm via ntg-context:
> Am 01.09.22 um 10:44 schrieb juh+ntg-context--- via ntg-context:
>>
>> Hi,
>>
>> what is resolution meant to do?

>> What am I missing?
> 
> The resolution parameter is still not used by default ConTeXt, sorry.
> 
> But you can use it with the attached lua file like:

This works also:

\startluacode
local function downsampler(oldname, newname, resolution)
     if not resolution or resolution == "" then
         resolution = 72
     end
     local cmd = string.format(
       [[gm convert -resample %ix%i %s %s]],
       resolution, resolution, oldname, newname)
     os.execute(cmd)
end

-- Set the PDF and default JPEG converters to the above function.
figures.converters.jpg.pdf = downsampler
figures.converters.jpg.default = downsampler
\stopluacode

I didn’t manage to plug this into the "conversion" mechanism.

Hraban
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
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___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01  8:56   ` Henning Hraban Ramm via ntg-context
@ 2022-09-01 10:37     ` juh+ntg-context--- via ntg-context
  2022-09-01 13:05       ` Henning Hraban Ramm via ntg-context
  0 siblings, 1 reply; 10+ messages in thread
From: juh+ntg-context--- via ntg-context @ 2022-09-01 10:37 UTC (permalink / raw)
  To: ntg-context; +Cc: juh+ntg-context

Hi Hraban,

Am 01.09.22 um 10:56 schrieb Henning Hraban Ramm via ntg-context:
> \startluacode
> local function downsampler(oldname, newname, resolution)
>      if not resolution or resolution == "" then
>          resolution = 72
>      end
>      local cmd = string.format(
>        [[gm convert -resample %ix%i %s %s]],
>        resolution, resolution, oldname, newname)
>      os.execute(cmd)
> end
> 
> -- Set the PDF and default JPEG converters to the above function.
> figures.converters.jpg.pdf = downsampler
> figures.converters.jpg.default = downsampler
> \stopluacode
> 
> I didn’t manage to plug this into the "conversion" mechanism.

Thanks a lot. With this I get 5.9MB instead of 13MB.

Maybe I can skip postprocessing the pdf file with ps2pdf.

 From an error message I guess that this script also tries to downsample 
png files. Is that correct?

juh
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01  8:51 ` Henning Hraban Ramm via ntg-context
  2022-09-01  8:56   ` Henning Hraban Ramm via ntg-context
@ 2022-09-01 11:43   ` juh+ntg-context--- via ntg-context
  2022-09-01 13:04     ` Henning Hraban Ramm via ntg-context
  2022-09-02  8:39   ` Keith McKay via ntg-context
  2 siblings, 1 reply; 10+ messages in thread
From: juh+ntg-context--- via ntg-context @ 2022-09-01 11:43 UTC (permalink / raw)
  To: ntg-context; +Cc: juh+ntg-context

Am 01.09.22 um 10:51 schrieb Henning Hraban Ramm via ntg-context:

> \loadluafile[grph-downsample]
> \doifmodeelse{print}{%
>      \def\Resolution{300}
> }{%
>      \def\Resolution{96}
> }%
> 
> \setupexternalfigures[
>    %directory={./Logos,img},
>    conversion=lowres.jpg,
>    resolution=\Resolution,
> ]

With the script I get strange results. I am not sure whether the 
resolution is correctly calculated.

And I am wondering what the script is doing with png files.

juh


___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01 11:43   ` juh+ntg-context--- via ntg-context
@ 2022-09-01 13:04     ` Henning Hraban Ramm via ntg-context
  2022-09-01 17:22       ` juh+ntg-context--- via ntg-context
  0 siblings, 1 reply; 10+ messages in thread
From: Henning Hraban Ramm via ntg-context @ 2022-09-01 13:04 UTC (permalink / raw)
  To: juh+ntg-context--- via ntg-context; +Cc: Henning Hraban Ramm

Am 01.09.22 um 13:43 schrieb juh+ntg-context--- via ntg-context:
> Am 01.09.22 um 10:51 schrieb Henning Hraban Ramm via ntg-context:
> 
>> \loadluafile[grph-downsample]
>> \doifmodeelse{print}{%
>>      \def\Resolution{300}
>> }{%
>>      \def\Resolution{96}
>> }%
>>
>> \setupexternalfigures[
>>    %directory={./Logos,img},
>>    conversion=lowres.jpg,
>>    resolution=\Resolution,
>> ]
> 
> With the script I get strange results. I am not sure whether the 
> resolution is correctly calculated.
> 
> And I am wondering what the script is doing with png files.

This one attacks all images, but it doesn’t calculate the final size 
correctly.

Hraban

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01 10:37     ` juh+ntg-context--- via ntg-context
@ 2022-09-01 13:05       ` Henning Hraban Ramm via ntg-context
  0 siblings, 0 replies; 10+ messages in thread
From: Henning Hraban Ramm via ntg-context @ 2022-09-01 13:05 UTC (permalink / raw)
  To: juh+ntg-context--- via ntg-context; +Cc: Henning Hraban Ramm

Am 01.09.22 um 12:37 schrieb juh+ntg-context--- via ntg-context:
> Hi Hraban,
> 
> Am 01.09.22 um 10:56 schrieb Henning Hraban Ramm via ntg-context:
>> \startluacode
>> local function downsampler(oldname, newname, resolution)
>>      if not resolution or resolution == "" then
>>          resolution = 72
>>      end
>>      local cmd = string.format(
>>        [[gm convert -resample %ix%i %s %s]],
>>        resolution, resolution, oldname, newname)
>>      os.execute(cmd)
>> end
>>
>> -- Set the PDF and default JPEG converters to the above function.
>> figures.converters.jpg.pdf = downsampler
>> figures.converters.jpg.default = downsampler
>> \stopluacode
>>
>> I didn’t manage to plug this into the "conversion" mechanism.
> 
> Thanks a lot. With this I get 5.9MB instead of 13MB.
> 
> Maybe I can skip postprocessing the pdf file with ps2pdf.
> 
>  From an error message I guess that this script also tries to downsample 
> png files. Is that correct?

According to the sources it should only attack JPEGs.

Hraban

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01 13:04     ` Henning Hraban Ramm via ntg-context
@ 2022-09-01 17:22       ` juh+ntg-context--- via ntg-context
  0 siblings, 0 replies; 10+ messages in thread
From: juh+ntg-context--- via ntg-context @ 2022-09-01 17:22 UTC (permalink / raw)
  To: ntg-context; +Cc: juh+ntg-context

Am 01.09.22 um 15:04 schrieb Henning Hraban Ramm via ntg-context:
> Am 01.09.22 um 13:43 schrieb juh+ntg-context--- via ntg-context:
>> Am 01.09.22 um 10:51 schrieb Henning Hraban Ramm via ntg-context:
>>
>>> \loadluafile[grph-downsample]
>>> \doifmodeelse{print}{%
>>>      \def\Resolution{300}
>>> }{%
>>>      \def\Resolution{96}
>>> }%
>>>
>>> \setupexternalfigures[
>>>    %directory={./Logos,img},
>>>    conversion=lowres.jpg,
>>>    resolution=\Resolution,
>>> ]
>>
>> With the script I get strange results. I am not sure whether the 
>> resolution is correctly calculated.
>>
>> And I am wondering what the script is doing with png files.
> 
> This one attacks all images, but it doesn’t calculate the final size 
> correctly.

For the records.
I need a resolution of 240 to get a good looking image.

This is more or less the same quality with 150 using the other possibility.

After playing around this day I fear that postprocessing with ps2pdf is 
more predictable and results in a way more tiny file.

juh


___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-01  8:51 ` Henning Hraban Ramm via ntg-context
  2022-09-01  8:56   ` Henning Hraban Ramm via ntg-context
  2022-09-01 11:43   ` juh+ntg-context--- via ntg-context
@ 2022-09-02  8:39   ` Keith McKay via ntg-context
  2022-09-02  9:26     ` Henning Hraban Ramm via ntg-context
  2 siblings, 1 reply; 10+ messages in thread
From: Keith McKay via ntg-context @ 2022-09-02  8:39 UTC (permalink / raw)
  To: mailing list for ConTeXt users; +Cc: Keith McKay


[-- Attachment #1.1: Type: text/plain, Size: 1634 bytes --]

Thanks for this code Hraban. I tried this last night and it worked really
well. I did have one stumbling block when I noticed that those image files
with a space in their names were not found, however renaming  without a
space solved the problem. Is this a bug or a feature?
Thanks
Keith McKay

On Thu, 1 Sep 2022, 09:52 Henning Hraban Ramm via ntg-context, <
ntg-context@ntg.nl> wrote:

> Am 01.09.22 um 10:44 schrieb juh+ntg-context--- via ntg-context:
> >
> > Hi,
> >
> > what is resolution meant to do?
> >
> > Whatever I insert as resolution, I get no change.
> >
> > \setupexternalfigure[location={default,local},resolution=30]
> > \starttext
> > \externalfigure[hacker]
> > \stoptext
> >
> > What am I missing?
>
> The resolution parameter is still not used by default ConTeXt, sorry.
>
> But you can use it with the attached lua file like:
>
>
> \loadluafile[grph-downsample]
> \doifmodeelse{print}{%
>         \def\Resolution{300}
> }{%
>         \def\Resolution{96}
> }%
>
> \setupexternalfigures[
>    %directory={./Logos,img},
>    conversion=lowres.jpg,
>    resolution=\Resolution,
> ]
>
>
> Hraban
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> https://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : https://contextgarden.net
>
> ___________________________________________________________________________________
>

[-- Attachment #1.2: Type: text/html, Size: 2691 bytes --]

[-- Attachment #2: Type: text/plain, Size: 496 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________

^ permalink raw reply	[flat|nested] 10+ messages in thread
* Re:  setupexternalfigures and resoĺution
  2022-09-02  8:39   ` Keith McKay via ntg-context
@ 2022-09-02  9:26     ` Henning Hraban Ramm via ntg-context
  0 siblings, 0 replies; 10+ messages in thread
From: Henning Hraban Ramm via ntg-context @ 2022-09-02  9:26 UTC (permalink / raw)
  To: Keith McKay via ntg-context; +Cc: Henning Hraban Ramm

[-- Attachment #1: Type: text/plain, Size: 580 bytes --]

Am 02.09.22 um 10:39 schrieb Keith McKay via ntg-context:
> Thanks for this code Hraban. I tried this last night and it worked 
> really well. I did have one stumbling block when I noticed that those 
> image files with a space in their names were not found, however 
> renaming  without a space solved the problem. Is this a bug or a feature?

The call to gm convert was lacking quoting of the file names. Fixed in 
attachment.

While the code does some downsampling, the calculation is not always 
right, because it doesn’t consider scaling (or something like that).

Hraban

[-- Attachment #2: grph-downsample.lua --]
[-- Type: text/plain, Size: 2779 bytes --]

if not modules then modules = { } end modules ['grph-downsample'] = {
  version   = 1.101,
  comment   = "companion to grph-inc.mkiv",
  author    = "Peter Münster", -- adapted to LMTX by Hraban
  copyright = "PRAGMA ADE / ConTeXt Development Team",
  license   = "see context related readme files"
}

assert(not figures.getinfo2)

figures.getinfo2 = function(name, page) -- [ [NTG-context] Pdf info with Lua/Ctx API ]
 if type(name) == "string" then
   name = { name = name, page = page }
 end

 if name.name then
   local data = figures.push(name)
   local info = figures.identify()

   if info.status.status ~= 0 then
     figures.check() -- !Counts pages here!
   end

   figures.pop()

   return --data
          info
 end
end


local format = string.format
-- figures.cachepaths.path = "cache" -- should be setup-option
local function sample_down(oldname, newname, resolution)
  print("DOWNSAMPLE sample_down " .. oldname .. " to " .. newname)
  local request = figures.current().request
  local width = request.width
  local height = request.height
  if resolution == "" then -- or (not width and not height) then
    print(format("DOWNSAMPLE Nothing to do: %s, %s, %s dpi, %s x %s px", oldname, newname, resolution, width, height))
    return
  end
  local TEXpt = 65536
  local inch = 72.27

  -- MkIV:
  -- local image = img.scan{filename = oldname}

  -- LMTX:
  local image = figures.getinfo(oldname,1)
  image = image.status.private

  local xy = image.xsize / image.ysize
  if (not width and not height) then
    -- no size requested? use default width
    width = 300 * TEXpt
  end
  if not width then
    height = height / TEXpt
    width = height * xy
  end
  if not height then
    width = width / TEXpt
    height = width / xy
  end
  width = math.floor(width)
  height = math.floor(height)
  print(format("DOWNSAMPLE image size %dx%dpx. requested %dx%d?", image.xsize, image.ysize, width, height))
  local xsize = math.floor(resolution * width / inch)
  local ysize = math.floor(resolution * height / inch)
  print(format("DOWNSAMPLE size %d x %d to %d x %d", image.xsize, image.ysize, xsize, ysize))
  if xsize < image.xsize or ysize < image.ysize then
    local s = format("gm convert -resize %dx%d -resample %dx%d \"%s\" \"%s\"",
                     xsize, ysize, resolution, resolution, oldname, newname)
    print("DOWNSAMPLE Conversion: " .. s)
    os.execute(s)
  else
    print(format("DOWNSAMPLE Nothing to do: %s, %s, %s dpi, %d x %d px", oldname, newname, resolution, width, height))
    print(format("DOWNSAMPLE xsize = %d, ysize = %d", xsize, ysize))
  end
end

local formats = {"png", "jpg", "gif"}

for _, s in ipairs(formats) do
  figures.converters[s] = figures.converters[s] or {}
  figures.converters[s]["lowres." .. s] = sample_down
end

[-- Attachment #3: Type: text/plain, Size: 496 bytes --]

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