[Randy Primozic]

In V4, when rendering with the GPU, I'm getting a quite noticeable black matting on all my images with an alpha channel. These look to be 4 pixels wide. Starting with a light grey and progressing to solid black. The remove black matting function in PS doesn't do much. Defringe does work. In contrast, CPU rendering produces a one pixel light grey matte which I can live with or remove black matting works very well. This is a real problem. I've upgraded my graphics card and V3 to V4 ($1000) to reduce render time but now have to work extra in PS to eliminate the black outline. The image from Maxwell should be usable right from the program. Any tips?

[luis.hijarrubia]

Do you mean custom alpha? As custom alpha is not yet supported on gpu.

[Randy Primozic]

No I don't mean custom alpha, it's not supported. output mode =rendered png + embedded alpha

[Forum Moderator]

Yes, I can confirm that.
It looks like the alpha channel, when launched with GPU is bigger than with CPU.

Will try to fix it.
Thanks for reporting.

Best regards,
Fernando