Syslinux - Apr 2003 - Making logos...

Hi!

I'm trying to create a custom logo for syslinux but keep bumping my head
on the conversion to LSS16. The sample syslogo.png works fine so I
decided to start with a known quantity by loading it into the Gimp.

I cleared the canvas, color filled a blue background (0x000033) placed
some yellow letters on the blue (0xffff00) and saved the file back out
with the default compression. The resulting image is 639x320 and 16
colors like the original syslogo.png. Here's the error I got with this
attempt and keep getting with all the others I tried:

pngtopnm syslogo.png | \
        ../ppmtolss16 \#000000=0 \#d0d0d0=7 \#f6f6f6=15 \
        > syslogo.lss
../ppmtolss16: Premature EOF at (516,308) of (639,320)
make: *** [syslogo.lss] Error 255

Any suggestions would be greatly appreciated! :)

Thanks,

-Tom

Tom Lisjac wrote:
>Hi!
>
>I'm trying to create a custom logo for syslinux but keep bumping my head
>on the conversion to LSS16. The sample syslogo.png works fine so I
>decided to start with a known quantity by loading it into the Gimp.
>
>I cleared the canvas, color filled a blue background (0x000033) placed
>some yellow letters on the blue (0xffff00) and saved the file back out
>with the default compression. The resulting image is 639x320 and 16
>colors like the original syslogo.png. Here's the error I got with this
>attempt and keep getting with all the others I tried:
>
>pngtopnm syslogo.png | \
>        ../ppmtolss16 \#000000=0 \#d0d0d0=7 \#f6f6f6=15 \
>        > syslogo.lss
>../ppmtolss16: Premature EOF at (516,308) of (639,320)
>make: *** [syslogo.lss] Error 255
>
Hi,

    This happens when the original file have a incongruent PNG Class.

    Will be very long to explain how to solve.

    The most immediate solution I can tell you is that your image must 
be PNG: PseudoClass, not "DirectClass"

    Start from: syslogo.png and use "display" from ImageMagick
tools/library

Regards,
Giovanni

PS. I am near to release a book about all the panorama. Check: 
http://www.YourLinux.org/
>
>Any suggestions would be greatly appreciated! :)
>
>Thanks,
>
>-Tom
>
>
>
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>  
>

Tom Lisjac wrote:
>Hello Dr. Orlando!
>
>  
>
>>    There are various reason for the previous error that Tom get.
>>
>>    The PseudoClass is one probably reason, not the only reason.
>>    
>>
>
>Thanks *very much* for your comments!
>
>I tried syslinux 2.03 but still haven't gotten the conversion to work. I
>appreciate your suggestions and am going to investigate them next.
>  
>
OK.

I personally spent a lot of time to reach the actual logo we have in out 
FTOSX.

Our logo it is really complicated to be create in a boot floopy.

Look it:

        http://www.futuretg.com/img/ftlogo_2003.png

I create it under the Mac ... and slowly decrease the color depth.

I check for you our actual logo. It uses "DirectClass", not
PseudoClass
as I comment before.

However, PseudoClass have a role.

Another role is to decress color-depth up you reach a size image and you 
can run the command


pngtopnm syslinux.png | ppmtolss16 \#000000=0 \#d0d0d0=7 
\#f6f6f6=15         > syslogo.lss


I take about two weeks or more to reach a good result.

You can get our actual boot logo from: http://www.rpmparadaise.org/
inside the package: installer-images.rpm

To decrease color-depth under Linux, I advice: "display" from
ImageMagick

http://www.imagemagick.com/www/display.html

Therefore, playing with color decrease and doing tests you can reach the 
result you are looking for.

"PseudoClass" play a role but color decrease is the detail that will 
help you.

Thanks,
Giovanni
>Best regards,
>
>-Tom Lisjac
>
>  
>

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