[libGD] #99 [Task opened] Using brushes with alpha transparency

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A new Flyspray task has been opened.  Details are below.

User who did this - Pierre Joye (Pierre)

Attached to Project - libGD
Summary - Using brushes with alpha transparency
Task Type - Bug Report
Category - Drawing function
Status - New
Assigned To - Pierre Joye
Operating System - All
Severity - Low
Priority - Normal
Reported Version - 2.0.35
Due in Version - Undecided
Due Date - Undecided
Details - Reported by Steve Lime:

I created a little test program and some brushes. You can nab them at:

 ftp://ftp.dnr.state.mn.us/pub/brushtest.zip

The archive contains 3 variable opacity brushes, test C program and one output image. The output image (test.png) is the result of;

  ./testbrush -brush brush_op10.png -output test.png -blend

Basically it draws a brushed line using a 10% opaque brush. It also copies the brush into the image so you can see how it looks alone. Checkout the ends of the line and you'll see the issue. I would expect (or was hoping) that the whole line would be a uniform thick line, a blended version of the brush and the black background. Kinda like you'd see with a paint brush tool in Gimp. That's not the case, the resulting line far more opaque than I would expect. I imagine pixels are getting set and blended over and over. The ends of the line are closer to the appearance I would expect.

More information can be found at the following URL:
http://bugs.libgd.org/?do=details&task_id=99

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