[PD] [GEM-dev] proper alpha channels in GEM?

[Patrice Colet]

Hello Ben, Cyrille, I answer to both for not flooding the list.

cyrille henry a écrit :
> imagemagick is quite strange with tiff export. you have to manually add 
> some option in order to have a valid tiff file.
> you can find the correct option somwhere on the net.
> 
> then, Gem load this file with no problem.

  I didn't find any option that enables the alpha channel in tiff files, 
I've tried -channel RGBA -matte, -alpha, ... there is no hint on the net 
for that.

B. Bogart a écrit :
 > I did a quick test and GIMP will convert a transparent PNG to TIF fine.
 > I don't have Gem working on this machine to test loading the tif, but I
 > can confirm it shows transparency. "convert" did do something strange to
 > the png file when converting to tif I can see...
 >
 > send me your tif if you still can't get it to work and I'll see if I can
 > confirm your troubles.
 >
 > .b.
 >

I'll use the batch mode of gimp since IM can't do this job, attached are 
three images, thesource.png, theresult.tiff, whatIwouldliketohave.tif



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