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rpaul

Alpha channel and curves

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So, It appeares that I should be able manipulate the alpha channel of a bitmap layer in curves, adjusting the opacity. And I was able to adjust an image with the alpha set to fully opaque 255 downwards to make it more transparent, however, I wasn't able to increase the opacity of an image with a translucent alpha channel. Is there a reason for this? or am I doing it wrong?

Thanks

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Hi rpaul :)

Sorry to hear you're having trouble. Could you please provide a screenshot of your layers panel? This sounds similar to a previously reported bug so I'd like to check!

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Thanks for getting back to me Dan,

So I uploaded three images of an AP file with two bitmapped sample layers and also the curves adjustment control showing three states. For the top layer I just selected the area outside of an oval and made the alpha channel (and text) more transparent. The center of the top layer text is still opaque. The first image shows the default state. The second image shows it when the slope is lowered to almost zero. The third image shows what happens when you raise the bottom end of the slope up close to maximum. My point here is that image 1 and 3 show no difference. What I've seen in other software is is that by raising the lower end of the curves upwards, the text outside the oval should become more opaque. I should also note that editing the center of the curves control doesn't seem to affect the image in a way that I would expect.

Since I started this topic, I discovered another way to influence the alpha channel. So my life doesn't hang on solving this issue.

Thanks.

 

72EA515F-DC26-42B4-AE0B-17FD3FAEF93D.jpeg

8E385CF7-E566-444A-8CB5-B42420931714.jpeg

BAC74BCC-2E11-40D3-A7B9-094CF09C0C93.jpeg

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Many thanks for your explanation and screenshots, this bug has been logged against the desktop version of Affinity Photo, so I'll bump this log with your thread now and hopefully this will be fixed shortly! :)

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