dzigakaiser Posted November 7, 2019 Posted November 7, 2019 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 Quote
firstdefence Posted November 7, 2019 Posted November 7, 2019 Have you tried right clicking the alpha layer and selecting rasterise to mask? dzigakaiser 1 Quote iMac 27" 2019 Sequoia 15.0 (24A335), iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9 (Please refrain from licking the screen while using this forum) Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions
Staff James Ritson Posted November 7, 2019 Staff Posted November 7, 2019 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. firstdefence and dzigakaiser 2 Quote @JamesR_Affinity for Affinity resources and more Official Affinity Photo tutorials
dzigakaiser Posted November 7, 2019 Author Posted November 7, 2019 Thank you so much! Both workflows are exactly what I was looking for and work like a charm:) Take care, Dziga firstdefence 1 Quote
firstdefence Posted November 7, 2019 Posted November 7, 2019 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. Quote iMac 27" 2019 Sequoia 15.0 (24A335), iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9 (Please refrain from licking the screen while using this forum) Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions
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