From: Henning Hraban Ramm <texml@fiee.net>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: degrade module
Date: Fri, 15 Feb 2019 08:24:50 +0100 [thread overview]
Message-ID: <34275BF1-3CCF-4E06-8BB5-7E23A361345C@fiee.net> (raw)
In-Reply-To: <B9CDCD39-A72E-4E31-B971-819B83D22781@toppkieker.info>
[-- Attachment #1: Type: text/plain, Size: 578 bytes --]
Am 2019-02-15 um 07:56 schrieb Lutz Haseloff <lutz.haseloff@toppkieker.info>:
> Thank you all for your help.
>
> First i tried the grph-downsample.lua script.
> Unfortunately i get an error message
> grph-downsample.lua:31: bad argument #2 to 'format' (number has no integer representation)
> See attached log file.
It’s a problem due to changes in Lua between 5.2 and 5.3 (or the like).
The attached version works (for me).
Greetlings, Hraban
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[-- Attachment #2: grph-downsample.lua --]
[-- Type: application/octet-stream, Size: 1601 bytes --]
if not modules then modules = { } end modules ['grph-downsample'] = {
version = 1.001,
comment = "companion to grph-inc.mkiv",
author = "Peter Münster",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local format = string.format
-- figures.cachepaths.path = "cache" -- should be setup-option
local function sample_down(oldname, newname, resolution)
local request = figures.current().request
local width = request.width
local height = request.height
if resolution == "" or (not width and not height) then
print(format("Nothing to do: %s, %s, %s", oldname, newname, resolution))
return
end
local TEXpt = 65536
local inch = 72.27
local image = img.scan{filename = oldname}
local xy = image.xsize / image.ysize
if not width then
width = height * xy / TEXpt
end
if not height then
height = width / xy / TEXpt
end
local xsize = resolution * width / inch
local ysize = resolution * height / inch
if xsize < image.xsize or ysize < image.ysize then
local s = format("gm convert -resize %dx%d %s %s",
xsize, ysize, oldname, newname)
print("Conversion: " .. s)
os.execute(s)
else
print(format("Nothing to do: %s, %s, %s", oldname, newname, resolution))
print(format("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: 493 bytes --]
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next prev parent reply other threads:[~2019-02-15 7:24 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 19:49 Lutz Haseloff
2019-02-14 20:22 ` Marco Patzer
2019-02-14 20:37 ` Peter Münster
2019-02-14 20:32 ` Peter Münster
2019-02-14 20:41 ` Wolfgang Schuster
2019-02-14 21:00 ` Peter Münster
2019-02-14 20:44 ` Hans Hagen
2019-02-15 6:56 ` Lutz Haseloff
2019-02-15 7:24 ` Henning Hraban Ramm [this message]
2019-02-15 7:25 ` Marco Patzer
2019-02-15 9:22 ` Lutz Haseloff
2019-02-15 10:08 ` Marco Patzer
2019-02-15 10:48 ` Lutz Haseloff
2019-02-15 11:23 ` Marco Patzer
2019-02-17 11:14 ` Peter Münster
2019-02-18 9:13 ` Marco Patzer
2019-02-18 10:03 ` Peter Münster
2019-02-18 15:25 ` Alan Braslau
2019-02-18 21:09 ` Peter Münster
2019-02-18 21:23 ` Alan Braslau
2019-02-18 22:50 ` Peter Münster
2019-02-18 23:21 ` Alan Braslau
2019-02-19 9:42 ` Peter Münster
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