* 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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* 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
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 8:56 ` 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
___________________________________________________________________________________
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* 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
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archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : https://contextgarden.net
___________________________________________________________________________________
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* 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 --]
___________________________________________________________________________________
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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wiki : https://contextgarden.net
___________________________________________________________________________________
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2022-09-01 8:44 setupexternalfigures and resoĺution juh+ntg-context--- via ntg-context
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2022-09-01 8:56 ` Henning Hraban Ramm via ntg-context
2022-09-01 10:37 ` juh+ntg-context--- via ntg-context
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2022-09-02 9:26 ` Henning Hraban Ramm via ntg-context
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