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Hello again,

can someone please tell me if it is possible to premultiply incoming EXRs with alpha channel?

Currently, when I open an EXR the alpha channel is on a separate pixel layer as a black and white mask instead of premultiplying RGB by it or loading the alpha channel into the actual alpha channel under channels...channel channel....channel channel.

This requires me to use the Flood Select Tool to get the mask from the alpha layer...^^ not very clean. The EXRs come from Redshift and act normal in PS and Nuke.

Affinity Photo 1.7.3 on Win 7

Take care,

Dziga

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Have you tried right clicking the alpha layer and selecting rasterise to mask?


iMac 27" Late 2015 Fully Loaded, iMac 27" Mid 2011 both running High Sierra 10.13.6 - Affinity Designer/Photo & Publisher - Illustrator CC, Inkscape, Blender, Sketchup, Pepakura Designer, MTC, Pixelmator & Pixelmator Pro + more... XP-Pen Artist-22E, - iPad Pro 12.9 B|  

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7 hours ago, dzigakaiser said:

Hello again,

can someone please tell me if it is possible to premultiply incoming EXRs with alpha channel?

Currently, when I open an EXR the alpha channel is on a separate pixel layer as a black and white mask instead of premultiplying RGB by it or loading the alpha channel into the actual alpha channel under channels...channel channel....channel channel.

This requires me to use the Flood Select Tool to get the mask from the alpha layer...^^ not very clean. The EXRs come from Redshift and act normal in PS and Nuke.

Affinity Photo 1.7.3 on Win 7

Take care,

Dziga

Hi Dziga, the option you're looking for is under Preferences>Colour, near the bottom you have several OpenEXR options. Enable "Associate OpenEXR alpha channels" to premultiply the alpha channels into the .RGB pixel layers. Hope that helps!

Also, there's no need to use the flood select tool. As @firstdefence mentioned above, you can also right click any layer including the greyscale alpha layer and choose Rasterise to Mask to convert it to a usable mask.


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5 hours ago, James Ritson said:

Hi Dziga, the option you're looking for is under Preferences>Colour, near the bottom you have several OpenEXR options. Enable "Associate OpenEXR alpha channels" to premultiply the alpha channels into the .RGB pixel layers. Hope that helps!

Another thing learned, thanks James.


iMac 27" Late 2015 Fully Loaded, iMac 27" Mid 2011 both running High Sierra 10.13.6 - Affinity Designer/Photo & Publisher - Illustrator CC, Inkscape, Blender, Sketchup, Pepakura Designer, MTC, Pixelmator & Pixelmator Pro + more... XP-Pen Artist-22E, - iPad Pro 12.9 B|  

Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions

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