Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: johan belmans on 2016-11-16, 13:23:31

Title: EXR default values
Post by: johan belmans on 2016-11-16, 13:23:31

Can the default values of the options of an  EXR be changed?
Now the default TYPE is RGBA, but I would like it to be RGB.
For example if you open an EXR saved with type RGBA in Affinity Photo, the alpha is applied to the Beauty layer.

Title: Re: EXR default values
Post by: maru on 2016-11-16, 13:33:45

Is this a Corona or 3ds Max thing? Is it possible to save some other default when using some other renderer?

Title: Re: EXR default values
Post by: johan belmans on 2016-11-16, 15:43:50

It could be Max which is responsible for the default values, I have no clue.

Title: Re: EXR default values
Post by: romullus on 2016-11-16, 15:50:09

AFAIK input-output operations are handled by Max itself and not by plugins. Nevertheless it should remember last used options and those options persists even between max sessions, i.e. if i choose to save as RGB instead of RGBA, next time RGB will be chosen by default, until i'll deceide to override that. Isn't that the case for you?

Title: Re: EXR default values
Post by: johan belmans on 2016-11-16, 18:25:10

thanks Romullus

Title: Re: EXR default values
Post by: Ondra on 2016-11-16, 19:15:37

Quote from: romullus on 2016-11-16, 15:50:09

AFAIK input-output operations are handled by Max itself and not by plugins. Nevertheless it should remember last used options and those options persists even between max sessions, i.e. if i choose to save as RGB instead of RGBA, next time RGB will be chosen by default, until i'll deceide to override that. Isn't that the case for you?

I just updated my signature... :D

Title: Re: EXR default values
Post by: romullus on 2016-11-16, 19:44:34

I'm affraid you'll run out of space for your signature pretty soon :]

Title: Re: EXR default values
Post by: maru on 2016-11-17, 12:56:55

Then Ondra will make a "FAQ train" just like Dubcat's.

Title: Re: EXR default values
Post by: pdaniun on 2016-11-17, 16:28:50

Affinity Beta is making waves i see. I had the same problem with alpha applied to every layer in exr file. I asked on the Affinity forum and it turns out that alpha is applied, if present. There is no option of saving it separately, like with OpenEXR or ArionFX plugin offers in Photoshop.
Turns out I've been saving my files wrongly for years, using RGBA, instead of RGB. But without it one must remember to add Alpha as render element.

Title: Re: EXR default values
Post by: johan belmans on 2016-11-17, 18:13:29

Quote from: pdaniun on 2016-11-17, 16:28:50

Affinity Beta is making waves i see. I had the same problem with alpha applied to every layer in exr file. I asked on the Affinity forum and it turns out that alpha is applied, if present. There is no option of saving it separately, like with OpenEXR or ArionFX plugin offers in Photoshop.
Turns out I've been saving my files wrongly for years, using RGBA, instead of RGB. But without it one must remember to add Alpha as render element.

Exactly what I figured out.
Apart from that Affinity is really impressive.

Title: Re: EXR default values
Post by: mraw on 2016-11-17, 22:25:25

Isn't there a chance to get an 'unpremultiply'-function( script maybe) for affinity? This should be only a matter of applying the math.
It's not convenient, but for an unpremultiply you could use another software like fusion( depends on the resolution of your image if you are allowed to use the free version)
Or maybe I don't understand the problem?

Title: Re: EXR default values
Post by: johan belmans on 2016-11-18, 09:34:31

Hi Mraw

true is should be a matter of appying math. The guys from Arion Fx are doing it.
But if you just take in mind to put the type as RGB and add an extra alpha pass as explained by pdanium, there is no problem.