AutoHotkey Community

I'm using "auto-scroll" script found on the wiki. It uses small bitmaps as splash images, and uses TransColor to make background color transparent.

Works fine in AHK Basic.
With AHK_L ansi X86 v 1.0.91.05 from 01-Jan-2011, on XP-Pro SP3, the Transcolor doesn't work for the SplashImage, but does work for a normal window.
With that same version of AHK_L running on Vista Home Premium 64-bit, TransColor DOES work for SplashImage.

The bitmaps used are just simple 32x32 pixel graphics. I tried changing them from 2-color 1-bit to 16-color, and even to 16m 24-bit. I also tried changing the "transparency" color. None of that made any difference

This is a sample of the code that is not working on my XP machine.
Bitmaps --- don't work
Notepad --- works



I only found one forum post about AHK_L and TransColor (about a very! fancy color picker), so I really need some assistance with this.
Is it an AHK_L problem, or a problem with my computer?

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Antique Newbie

I have now tested the script on two XP-SP3 machines with same result.

TransColor for the SplashImage DOES NOT work with AHK_L.
It DOES work with AHK Basic.

Please, can somebody take a short moment to make a small graphic and test my script snippet, to see if you duplicate my findings?

Your help will be much appreciated.

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Antique Newbie

Using a 32x32 8-bit bitmap, I have confirmed that this problem occurs on Windows XP but not Windows 7. AutoHotkey Basic and AutoHotkey_L Revision 58 and earlier are not affected, thus it seems to be related to the following change in Revision 59:

I've moved the thread to Bug Reports as this appears to be a bug.

It turns out the GDI bitmap generated by GDI+ has something wrong with its alpha channel, and this causes problems with the window's colour-keying. Rather than coding a hack-fix for this specific case, I've changed SplashImage to attempt the non-GDI+ image-loading methods first, then if that fails, fall back to GDI+. If you'd like to test before I release v1.0.93.00, see this thread.

Ok, that's a dead bug!

Thank you.

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Antique Newbie