color problem while converting PDF -> JPG

[sergiiiiiii]

It seems to have a problem with the flattering of a PDF with transparency.

Here's the command line used to convert the PDF :
convert -colorspace RGB test.pdf[0] test.jpg

The result image :


The result image from Acrobat (the good one) :


Do I use ImageMagick badly ?

Thanks

[Drarakel]

Getting correct colors from PDFs can be a difficult task sometimes - as this depends more on Ghostscript (not so much on ImageMagick).
Can you upload your PDF?

[sergiiiiiii]

Here's the PDF :

http://www.megafileupload.com/en/file/2 ... t-pdf.html

[Drarakel]

First: You probably have to update Ghostscript. I'm using current versions (Ghostscript 8.71, ImageMagick 6.6.1-5) and have better results/colors (with a simple "convert -density 300 test.pdf[0] output.png" command):
http://www.imagebanana.com/img/m84z7a2n ... dpi_im.png

But: There is still a difference to the Adobe output. (Adobe Reader shows that for me.) Sorry, I don't know what causes this..
One can see that the PDF has some transparency values in it - the 21 red squares go from fully opaque to fully transparent (1.0 to 0.0, with 0.05 steps; the 8th value seems to be off, it's 0.62 instead of 0.65 there). I can recreate the transparency with ImageMagick (without the PDF) and do get the same red tones as Adobe.. So I guess the Adobe output is the correct one.

ImageMagick has no fault here. You'll probably have to take this to the Ghostscript site if you want to resolve it.

[sergiiiiiii]

I'll watch GhostScript for this problem.

Thanks.