Re: [GD-DEVEL] Problem with transparency

The mail list won't let me send attachments.  Any other ideas how I can 
get the files to you guys to look at?

- Brian

> Brian Peschel wrote:
>> Looks like the mailing list didn't like my attachments.  Let me try 
>> again.....
>>
>> - Brian
>>
>> Brian Peschel wrote:
>>> Pierre Joye wrote:
>>>> That means:
>>>>
>>>> gif has a transparent color (background color), the color index is 3
>>>> All other has no transparent color (expected for JPEG, not sure if XPM
>>>> supports a background color). It could be the reason why the copy does
>>>> not work as you expect. However it would help if you show us the
>>>> source and destination images (per format), it will help to understand
>>>> exactly what you like to achieve (and what happens now with
>>>> xpm/jpeg/png).
>>>>
>>>> Cheers,
>>>>   
>>>
>>> Okay, I poked around a bit more.  It appears my JPG image did not 
>>> have transparency set correctly, hence it not working.  And it looks 
>>> like I can get it working with the PNG file also.  From what I can 
>>> find on the web, setting a color in the XPM to 'None' will cause 
>>> transparency (which does work in X using a 
>>> XpmCreatePixmapFromData(), XSetClipMask(), XSetClipOrigin(), and 
>>> XCopyArea() combination).  In other words the line:
>>> "0 c None"
>>> means transparent.
>>>
>>> So, I took the tiling example at http://www.libgd.org/CopyResize and 
>>> tweaked it a bit to match my usage (hopefully my attachments come 
>>> through), see plotTest3.C.  I ran this with the four sample images 
>>> (small.*).
>>> plotTest3 small.gif ; mv tiled.jpg tiled.gif.jpg
>>> small.gif Width 8 height 8 transparent 1
>>>
>>> plotTest3 small.jpg ; mv tiled.jpg tiled.jpg.jpg
>>> small.jpg Width 8 height 8 transparent -1
>>>
>>> plotTest3 small.png ; mv tiled.jpg tiled.png.jpg
>>> small.png Width 8 height 8 transparent -1
>>>
>>> plotTest3 small.xpm ; mv tiled.jpg tiled.xpm.jpg
>>> small.xpm Width 8 height 8 transparent -1
>>>
>>> The gdImageGetTransparent() result only shows a value for the GIF, 
>>> not for the other 3.  However, the PNG did work (tiled.*.jpg).
>>>
>>> So, I have it working for GIF and PNG.  It isn't working for JPG 
>>> (but I am fairly confident it it the source file).  It doesn't work 
>>> with XPM.  Do I assume that it not working for XPM is a GD issue 
>>> based on Pierre's comments above?
>>>
>>> Thanks!
>>>
>>> - Brian
>>>
>>