Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: muoto on 2021-11-20, 12:06:25

Title: strong banding when saving
Post by: muoto on 2021-11-20, 12:06:25

Hello,

i have very strong banding effects on subtle coronasky gradients when i save as JPG (or tiff 8bit) which are not at all visible in the VFB.

i tried with or without luts, its the same.

when i save as 32bit exr, and then convert in PS, it's OK.

Any ideas ?

Thanks

(max2022 cororna 7 latest release)

ps: attached screenshot, left is the saved jpg, right the VFB (some obvious small jpg compression also while posting, but still... and strangely the color is a little off as well !

Title: Re: strong banding when saving
Post by: TomG on 2021-11-21, 17:55:25

Probably due to the way the host software (Max) is converting the image down to 8 bits on saving (the save routines are not part of Corona, but part of the host software). Could try a format like PNG, or could stay with your current method of saving with a full bit depth and letting some other software do that conversion step.

Title: Re: strong banding when saving
Post by: muoto on 2021-11-23, 11:52:35

isn't that problematic that what you see in the vfb isn't saved correctly ? Anyway, even if the data in the vfb is linear, the image is still 8bit on your screen, no ?

Title: Re: strong banding when saving
Post by: maru on 2023-02-17, 11:36:29

As Tom explained, this is related to the subtle differences between what we display in the VFB and what is displayed in other software (gamma 2.2 vs sRGB gamma). This may be fixable in the future, but is independent from us.
Also, it depends on the monitor - I can see strong banding in the left and right example.