59 lines
3.0 KiB
Markdown
59 lines
3.0 KiB
Markdown
[[!template id=gitbranch branch=chrysn/imgforpdf author="[[chrysn]]"]]
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when using the [[img plugin|plugins/img]] with an svg file, it is supposed to
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convert it into a png for display in all browsers, and because the typical use
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case is rendering small preview versions.
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this currently doesn't work (at least with graphicsmagick-libmagick-dev-compat
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1.3.18-1) due to the sequence imagemagick options are set, needs an extension
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to work for pdfs (or any other imagemagick compatibile file) too, and should
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have an additional parameter for page selection.
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i've provided a series of [[!taglink patch]]es in the chrysn/imgforpdf [[git]]
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branch.
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i'd prefer to go a step further, and not only convert pdf and svg files to png,
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but everything (with the possible exception of jpg files), as most other image
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formats can't be displayed in a browser anyway -- but i didn't in this patch
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series, as it would alter the file names of existing images, i don't know if
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that needs special care or breaks something i don't use; this way, my patches
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should be safe for inclusion.
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--[[chrysn]]
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> update 2014-06-29: the patch still applies and fixes the issue. in the
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> meantime, i noticed that the desired effect doesn't happen when no explicit
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> size is set. as scalable graphics don't necessarily have a natural size
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> anyway, i don't consider that a showstopper. --[[chrysn]]
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>> This all looks good in principle, but I would like to do a more detailed
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>> review, and test it with "real ImageMagick" in case its behaviour differs
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>> from GraphicsMagick.
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>>
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>> An automated regression test for the desired behaviour in `t/` would
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>> be great. There are SVGs and PNGs in the docwiki already; there are no
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>> JPEGs or PDFs, but perhaps you could add a trivially small example
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>> of each to `t/`? Imitating `t/tag.t` or `t/trail.t`, and skipping the
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>> test if the required modules are missing like `t/podcast.t` does,
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>> seems like it would work best.
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>>
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>> I agree that everything not in an interoperable web format should be
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>> converted to PNG when it's scaled down, but yes, that's more likely
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>> to be a breaking change, so it seems best to do that as a separate
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>> branch. In practice I think this means JPEG -> JPEG and everything
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>> else -> PNG, since JPEG is commonly used for photos and photo-like
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>> images that don't compress well under lossless compression. --[[smcv]]
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>>> i've added a unit test and tested it with the [[!debsid perlmagick]]
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>>> package, the [[!debsid graphicsmagick-libmagick-dev-compat]] package and
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>>> the experimental [[!debpts libimage-magick-perl]] package (where the
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>>> [[!debpts libmagickcore-6.q16-2-extra]] package is required too), in the
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>>> meantime filing [[!debbug 753770]]. (why is it that it sometime seems i
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>>> find more bugs in ikiwiki's dependencies than in itself when working with
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>>> it?)
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>>>
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>>> the unit test also checks for file removal when it is not created any more,
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>>> which works, so my biggest fear about the all-to-png change is unwarranted.
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>>> i'll have a look at that some time, but i think as things are, this is
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>>> ready now, please review again. --[[chrysn]]
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