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Thread: Hardy imagemagick problem creating xpm for grub

  1. #1
    Join Date
    Aug 2007
    Location
    Florence, Italy
    Beans
    3
    Distro
    Ubuntu 8.10 Intrepid Ibex

    Lightbulb [Solved] Hardy imagemagick problem creating xpm for grub

    I have a strange problem: I'm tryng to convert some jpg to xpm with the common command
    Code:
    $ convert -resize 640x480\! -colors 14 picture.jpg picture.xpm
    It looks good (well, 14 colors, obviously) viewing with display, eog, gthumb, GIMP. Then gzip and the other stuff. Well, this image loads as splashimage, but in GRUB colors are all wrongs, as my PC has assumed some LSD. Loading the same picture with GIMP and saving (without any modify) results in good colors with GRUB. How is it possible?
    Identify give this result:
    Code:
    $ identify YaquinaHeadLighthouseGimp.xpm 
    YaquinaHeadLighthouseGimp.xpm XPM 640x480 640x480+0+0 DirectClass 16-bit 302.164kb
    
    $ identify YaquinaHeadLighthouseMagick.xpm  
    YaquinaHeadLighthouseMagick.xpm XPM 640x480 640x480+0+0 PseudoClass 14c 16-bit 302.283kb
    All I can see is that one is DirectClass, the other PseudoClass. I looked for a way to force DirectClass, but nothing works. Someone can try this? Is this a bug in ImageMagick? I'm using Hardy Heron.
    Code:
    $ convert -version
    Version: ImageMagick 6.3.7 02/19/08 Q16 http://www.imagemagick.org
    Copyright: Copyright (C) 1999-2008 ImageMagick Studio LLC
    [UPDATE] To try splashimage without reboot see http://wiki.debian.org/Grub/SplashImage "Testing with QEMU". Thanks.

    SOLUTION
    The problem is solved with the option -depth, the command become:
    Code:
    $ convert picture.jpg -resize 640x480\! -colors 14 -depth 8 picture.xpm
    Without this option IM created a 16-bit image, whereas GIMP created as default a 8-bit image... Not a problem of DirectClass or PseudoClass. I could realize only with identify -verbose, which says the true depth... damn it!
    Last edited by gasolino_; May 10th, 2008 at 04:47 PM. Reason: Problem solved

  2. #2
    Join Date
    Dec 2007
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    /home
    Beans
    483

    Re: Hardy imagemagick problem creating xpm for grub

    Interesting... I'd been wondering why it didn't work, and just decided to create them in Feisty while it was fixed... ah the lazyness! Thanks for figuring this out.
    Don't eff with The Cult...

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