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Add or Plus equivalent in Merge tool
Posted:
Mon Dec 15, 2014 10:27 amby Ludvik Koutny
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.
Re: Add or Plus equivalent in Merge tool
Posted:
Mon Dec 15, 2014 10:33 amby Jiri Sindelar
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
Re: Add or Plus equivalent in Merge tool
Posted:
Mon Dec 15, 2014 10:45 amby Ludvik Koutny
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.
Re: Add or Plus equivalent in Merge tool
Posted:
Mon Dec 15, 2014 12:33 pmby Jiri Sindelar
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
Re: Add or Plus equivalent in Merge tool
Posted:
Mon Dec 15, 2014 1:37 pmby Ludvik Koutny
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...
Re: Add or Plus equivalent in Merge tool
Posted:
Mon Dec 15, 2014 4:28 pmby Marek Subocz
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).