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Old 26 March 2015, 20:13   #1
Minuous's Avatar
Join Date: Oct 2001
Location: Canberra/Australia
Posts: 1,834
Screenshots are off by one frame

I have been making a lot of screenshots with WinUAE 3.0.0 and I noticed that the generated screenshots don't actually correspond to what is shown on the screen: they are one frame earlier or later, at least as far as the palette is concerned.

(This causes problems with eg. Druid 2 game when using "Deathland" powerup, which changes the palette every few frames. It is impossible to tell from looking at the WinUAE screen which palette has been saved in the screenshot, necessitating taking a whole series of screenshots in rapid succession and then loading them into a paint program to check whether any of them have the desired palette.)

My apologies if this bug has already been reported: I did a search and noticed that "RTG mode screenshots in 16-bit host color depth mode had wrong colors" has been fixed, but this appears to be a different bug (as the game uses OCS not RTG).
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Old 29 March 2015, 18:30   #2
Toni Wilen
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Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 22,109
It is not a bug, at least not if you use "before filtering" option. Screenshot comes from internal buffer, not what you see and depending on display settings (number of backbuffers), delay may be up to 4 frames.

Some kind of burst screenshot option probably is better solution (takes 10 or so screenshot frames automatically).
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