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TIF convert to pdf colour change

description

I have been trying to convert a TIF file in Lab colorspace to PDF format, but the converted file has the colors changed.

When converting to PDF, I end up with a file like [Tiff-Lab-300DPI.tif_ImageConverter.pdf]..

Note: I also do a bit of resizing before converting to PDF.

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dlemstra wrote Feb 4 at 9:10 AM

I can reproduce your issue. Changing the ColorSpace of the image to srgb solves the issue. I wonder why the PDF document is using the wrong colorspace. I will need to investigate this some more. I will come back to this topic when I have more info.

dlemstra wrote Feb 20 at 9:56 PM

I haven't found a cause for this yet. Will take another look in a couple weeks.

Aberdyne wrote Mar 6 at 12:22 PM

Hello, I had a similar issue while loading jpg image with CMYK colourspace. When I used them for compositing with other picture (RVB) colours seemed inverted... The TIFF image is saved in the LAB colourspace here so I presume it's the same problem.

Also I found this: http://www.imagemagick.org/Usage/resize/#resize_colorspace

Apparently we need to convert colourspace to linear RGB (from any other colourspace including sRGB which is gamma corrected) BEFORE doing the reisze... can you confirm?