[jira] [Commented] (PDFBOX-1993) Gray color images much lighter

["John Hewson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-1993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13943742#comment-13943742 ] 

John Hewson commented on PDFBOX-1993:
-------------------------------------

That's interesting, there might be a difference in how PDF defines a gray colorspace vs how Java defines it.

> Gray color images much lighter
> ------------------------------
>
>                 Key: PDFBOX-1993
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1993
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: Tilman Hausherr
>            Priority: Minor
>         Attachments: gray-bad.png, gray-cow-bad.png, gray-cow-good.png, gray-good.png
>
>
> In testCreateLosslessFromImageRGB() I create a grayscale image, and in LosslessFactory.createFromImage() I save it as a grayscale image (that part is currently disabled, search and enable the part with BufferedImage.TYPE_BYTE_GRAY. When this is enabled, testCreateLosslessFromImageRGB() fails the identity test. The expected and the actual images are attached. I traced this effect to PDColorSpace.toRGBImageAWT(), where I saved the "src" and the "dest" image and got two different ones. But even the first one is already different to the grayscale image I created in the test.
> The two attached file pairs were created by writing the BufferedImage src and dst in PDColorSpace.toRGBImageAWT().



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