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https://issues.apache.org/jira/browse/FOP-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782870#comment-16782870
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Stefan Hegny commented on FOP-2849:
-----------------------------------
The issue seems to be the value "1" thats inside these BMPs at the horizontal /
vertical resolution. Placing 0 at that value makes the images well-behaved.
Probably not fop error at all, sorry!
> Scaling of Grayscale Windows BMP
> --------------------------------
>
> Key: FOP-2849
> URL: https://issues.apache.org/jira/browse/FOP-2849
> Project: FOP
> Issue Type: Bug
> Components: image/unqualified
> Affects Versions: 2.2
> Environment: Linux
> Reporter: Stefan Hegny
> Priority: Minor
> Attachments: big.bmp, big.fo
>
>
> I'm using external-graphics with grayscale 8bit Windows BMP Files. Whenever
> the Image has to be scaled down, in the pdf it is flipped horizontally,
> acutally not keeping its aspect ratio, and the grayscales look dim. See
> big.fo. Sometimes when using imagemagic convert (-depth 8 -colors 256 -type
> grayscale) I also managed to get it flipped vertically and goes out of the
> block at the top.
> Extracting the image with pdfimages gives a ppm, its aspect rafio is correct
> but still the colours are dim.
> FO Files and sample BMPs are attached and here:
> [https://www.magentacloud.de/share/6x.svy3pz9]
> The small works ok, the big shows the described effect with FOP 2.2 - Im not
> sure if the issue is FOP of the Java Image IO, please advise
> Thanks & regards, Stefan
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