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Poor quality png image
Posted:
Fri Jan 15, 2021 1:46 pmby ebody_cut
Hi,
i use a png image with transparent background in my video. But the quality is terrible. The size is 200x200 pixel and use it a little bit smaler. I zoom the png image to scale it.
If i use the image in photoshop or drag it to a browser it´s all fine.
How do i get a clean png image into the video?
Best regards,
ebody
Re: Poor quality png image
Posted:
Fri Jan 15, 2021 2:15 pmby Jim Simon
What version of Resolve?
Re: Poor quality png image
Posted:
Fri Jan 15, 2021 2:18 pmby ebody_cut
Jim Simon wrote:What version of Resolve?
16.2.8.005
Re: Poor quality png image
Posted:
Fri Jan 15, 2021 3:06 pmby Jim Simon
Alright.
I didn't see any image scaling issues in 16 (I do in 17), so I'm not sure what's the issue.
Just to get you moving forward, maybe scale the image in Photoshop to the correct size?
Re: Poor quality png image
Posted:
Fri Jan 15, 2021 4:19 pmby waltervolpatto
If you scale that in the edit page, open the inspector and set the scaling option algorithm to "softer"
Re: Poor quality png image
Posted:
Fri Jan 15, 2021 8:48 pmby richards
The issue is that PNG's only support Straight alpha, which means that there's hidden colour data in the transparent areas of your image - most likely black or white, but it could be anything. When you resize the image, you're stretching both the (separate) transparency and the colour data, which results in the normally-hidden colour data in the transparent areas bleeding into the non-transparent areas.
The correct solution is to use Premultiplied alpha, which PNG's do not support. If you go this route (IIRC TIFF's do support Premultiplied) but I can't remember the exact workflow to get them out of Photoshop correctly - it's a pain from memory, really hard to verify, and therefore really easy to mess up and wonder why it's not working...