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Add or Plus equivalent in Merge tool

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Ludvik Koutny

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Add or Plus equivalent in Merge tool

PostMon Dec 15, 2014 10:27 am

Hi,

i may be completely stupid, but i am really unable to figure out which mode of merge tool is equivalent of ADD operation. I will be thankful for any clue.

Thanks in advance.
https://www.artstation.com/rawalanche
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Jiri Sindelar

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Re: Add or Plus equivalent in Merge tool

PostMon Dec 15, 2014 10:33 am

Hi,
for Add in merge node, use Apply mode: Normal, Operator: Over as for normal merge, and set Alpha Gain slider to 0.

hth

Jirka
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Ludvik Koutny

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Re: Add or Plus equivalent in Merge tool

PostMon Dec 15, 2014 10:45 am

Jiri Sindelar wrote:Hi,
for Add in merge node, use Apply mode: Normal, Operator: Over as for normal merge, and set Alpha Gain slider to 0.

hth

Jirka


Thank you very much. So what exactly does Alpha gain do in this case. I find a bit confusing there is a slider which blends between over and add mode. As one seems to be math operation while other one seems to be blend operation.
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Jiri Sindelar

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Re: Add or Plus equivalent in Merge tool

PostMon Dec 15, 2014 12:33 pm

https://web.archive.org/web/20131229040 ... ools/merge

"Alpha Gain linearly scales the values of the foreground’s alpha channel. In subtractive merges, this controls the density of the composite, similarly to Blend. In additive merges, this effectively reduces the amount that the background is obscured by, thus brightening the overall result. In an additive merge with Alpha Gain set to 0.0, the foreground pixels are simply added to the background."

hth

Jirka
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Ludvik Koutny

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Re: Add or Plus equivalent in Merge tool

PostMon Dec 15, 2014 1:37 pm

Jiri Sindelar wrote:https://web.archive.org/web/20131229040424/http://manual.eyeonline.com/eyeonmanual/fusion/tool-reference/composite-tools/merge

"Alpha Gain linearly scales the values of the foreground’s alpha channel. In subtractive merges, this controls the density of the composite, similarly to Blend. In additive merges, this effectively reduces the amount that the background is obscured by, thus brightening the overall result. In an additive merge with Alpha Gain set to 0.0, the foreground pixels are simply added to the background."

hth

Jirka



Thank you :)

Now it makes perfect sense...
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Marek Subocz

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Re: Add or Plus equivalent in Merge tool

PostMon Dec 15, 2014 4:28 pm

hi,
if You specifically want to use Add / Over merge operation - You can use Add / Over Fuses - these are faster in rendering, because of limited options (i.e. no transform, filtering, also clipping outside of the image format).

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