[NTG-context] Re: setupexternalfigures and resoĺution
This thread about downsampling external images on the fly is a really helpful
feature! Thanks, Hraban for sharing the code!
I was wondering if it was possible to downscale also raster images embedded in
pdf/svg files loaded via \externalfigure?
I found a ghostscript solution online
(https://stackoverflow.com/questions/9497120/how-to-downsample-images-within-pdf-file)
gs \
-o downsampled.pdf \
-sDEVICE=pdfwrite \
-dDownsampleColorImages=true \
-dDownsampleGrayImages=true \
-dDownsampleMonoImages=true \
-dColorImageResolution=72 \
-dGrayImageResolution=72 \
-dMonoImageResolution=72 \
-dColorImageDownsampleThreshold=1.0 \
-dGrayImageDownsampleThreshold=1.0 \
-dMonoImageDownsampleThreshold=1.0 \
input.pdf
Now, I'm wondering how to adapt grph-downsample.lua to do this?
I've tried:
\setupexternalfigure[
resolution=\Resolution, conversion=lowres.pdf
]
And added to grph-downsample.lua
local function sample_down_pdf(oldname, newname, resolution)
print("DOWNSAMPLE sample_down " .. oldname .. " to " .. newname)
-- MkIV:
-- local image = img.scan{filename = oldname}
-- LMTX:
local image = figures.getinfo(oldname,1)
image = image.status.private
local s = format("gs \
-o \"%s\" \
-sDEVICE=pdfwrite \
-dDownsampleColorImages=true \
-dDownsampleGrayImages=true \
-dDownsampleMonoImages=true \
-dColorImageResolution=%s \
-dGrayImageResolution=%s \
-dMonoImageResolution=%s \
-dColorImageDownsampleThreshold=1.0 \
-dGrayImageDownsampleThreshold=1.0 \
-dMonoImageDownsampleThreshold=1.0 \
\"%s\"",
oldname, resolution, resolution, resolution, newname)
print("DOWNSAMPLE Conversion: " .. s)
os.execute(s)
end
figures.converters["pdf"]["lowres." .. "pdf"] = sample_down_pdf
But I must be missing something as the code doesn't seem to be called.
Any suggestions?
Thanks!
Ben
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[NTG-context] Cron /var/www/aanhet.net/context/bin/cron/context-mirror
receiving incremental file list ./ ctan.lsr document-2.htm download-1.htm download-2.htm logo-ade.png logo-cts.png logo-pod.png rss.xml show-fil.pdf context/latest/ context/latest/cont-lmt.zip context/latest/cont-mpd.zip context/latest/cont-ppc.zip context/latest/cont-sci.zip context/latest/cont-tmf.zip context/latest/cont-tst.7z context/latest/cont-tst.tar.xz context/latest/cont-tst.zip sent 175,476 bytes received 39,200,805 bytes 2,715,605.59 bytes/sec total size is 562,234,713 speedup is 14.28 Running archiver: New dir: /var/www/aanhet.net/context//htdocs/archives/context-2023-07-28.21 233581279 /var/www/aanhet.net/context//htdocs/archives/context-2023-07-28.21/latest 126745317 /var/www/aanhet.net/context//htdocs/archives/context-2023-07-28.21/current 360330692 /var/www/aanhet.net/context//htdocs/archives/context-2023-07-28.21 360330692 total ___ 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 ___
[NTG-context] Re: Par Builder Tests
Thanks Hraban, didn't think of that so will give it a try. Best Wishes Keith On Fri, 28 Jul 2023, 17:28 Henning Hraban Ramm, wrote: > Am 28.07.23 um 17:04 schrieb Keith McKay: > > I played around with the setups for the align:pass:test4 code below, as > > Hans suggested, and it was changing the \tolerance value which made the > > difference. Increasing the \tolerance value to 1000 eliminated all > > overfull hboxes but still left 79 underfull hboxes. I continued to > > increase the \tolerance value up to 6600 and was left with two overfull > > hboxes. One with a badness of 6641 (warAndPeace1.png) and one with a > > badness of 1097 (warAndPeace2.png). Above the \tolerance of 6600 only > > warAndPeace2.png was left with a badness of 1097. Both of these > > underfull hboxes were at the beginning of a paragraph - "To his Honor" > > in the first png and "Well, you see," in the second png. I not sure a > > reader would spot the second png badness but the first is noticeable to > > my eyes. > > Hi Keith, > since both cases are caused by names with accents, did you try to add > hyphenation exceptions for those? Such cases are probably not covered by > English hyphentation rules. > > 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 > > ___ > ___ 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 ___
[NTG-context] Re: Par Builder Tests
Am 28.07.23 um 17:04 schrieb Keith McKay: I played around with the setups for the align:pass:test4 code below, as Hans suggested, and it was changing the \tolerance value which made the difference. Increasing the \tolerance value to 1000 eliminated all overfull hboxes but still left 79 underfull hboxes. I continued to increase the \tolerance value up to 6600 and was left with two overfull hboxes. One with a badness of 6641 (warAndPeace1.png) and one with a badness of 1097 (warAndPeace2.png). Above the \tolerance of 6600 only warAndPeace2.png was left with a badness of 1097. Both of these underfull hboxes were at the beginning of a paragraph - "To his Honor" in the first png and "Well, you see," in the second png. I not sure a reader would spot the second png badness but the first is noticeable to my eyes. Hi Keith, since both cases are caused by names with accents, did you try to add hyphenation exceptions for those? Such cases are probably not covered by English hyphentation rules. 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 ___
[NTG-context] Re: Par Builder Tests
Hi all!
Using the example below I have completed a test using a larger book.
This time I downloaded War and Peace from the Gutenberg Project and
extracted the individual xhtml files for Context.
I played around with the setups for the align:pass:test4 code below, as
Hans suggested, and it was changing the \tolerance value which made the
difference. Increasing the \tolerance value to 1000 eliminated all
overfull hboxes but still left 79 underfull hboxes. I continued to
increase the \tolerance value up to 6600 and was left with two overfull
hboxes. One with a badness of 6641 (warAndPeace1.png) and one with a
badness of 1097 (warAndPeace2.png). Above the \tolerance of 6600 only
warAndPeace2.png was left with a badness of 1097. Both of these
underfull hboxes were at the beginning of a paragraph - "To his Honor"
in the first png and "Well, you see," in the second png. I not sure a
reader would spot the second png badness but the first is noticeable to
my eyes.
I'm very pleased how the book has turned out, all 1668 pages of it as an
approximately 13cm by 20cm book. The pdf is 4MB and each run in ConTeXt
takes about 10 seconds on my M1 mac mini.
I'm interested in seeing how \setupalignpass develops and learning more
of how to use it.
Best Wishes
Keith McKay
On 21/07/2023 17:33, Keith McKay wrote:
Thanks Hans!
I'll have a play and keep an eye on updates
Best Wishes
Keith
On 21/07/2023 17:10, Hans Hagen via ntg-context wrote:
Hi Keith,
Here an example that Mikael made for such a book:
\showframe
% let's very strict
\startsetups [*default]
\directsetup{*reset}
\frozen\widowpenalty 1
\frozen\clubpenalty 1
\frozen\displaywidowpenalty 1
\frozen\brokenpenalty 0 % \defaultbrokenpenalty
\stopsetups
% we enable the use of expansion (this feature might become preset
% because we now delay setting the vectors anyway so less overhead)
\definefontfeature
[default]
[default]
[expansion=quality,
protrusion=quality,
itlc=yes]
% vertical expansion
\setuplayout
[vz=2]
% for which we need:
% \setupalign[hanging,depth,stretch,granular]
\setupalign[depth,stretch,granular]
% here are the passes:
\startsetups align:pass:test4
\pretolerance 100
\tolerance 200
\parpasses 4
classes \indecentparpassclasses
threshold 0.025pt
adjustspacing 3
adjustspacingstep 1
adjustspacingshrink 5
adjustspacingstretch 10
next
classes \indecentparpassclasses
threshold 0.025pt
adjustspacing 3
adjustspacingstep 1
adjustspacingshrink 10
adjustspacingstretch 20
next
classes \indecentparpassclasses
threshold 0.025pt
adjustspacing 3
adjustspacingstep 1
adjustspacingshrink 25
adjustspacingstretch 50
next
classes \indecentparpassclasses
threshold 0.025pt
adjustspacing 3
adjustspacingstep 1
adjustspacingshrink 50
adjustspacingstretch 100
\relax
\stopsetups
\setupalignpass[test4]
\starttext
...
\stoptext
(work in progress so keep an eye on updates)
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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