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Difference layer mask

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  #1  
Old 04-09-2011, 02:53 PM
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Boneappetit Boneappetit is offline
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Difference layer mask

I just want to know, how to create a Difference layer mask... maybe the correct term is Difference mask, i'm not sure...
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Old 04-09-2011, 03:49 PM
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Re: Difference layer mask

Explain the question. I don't understand
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Old 04-09-2011, 04:03 PM
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Re: Difference layer mask

I kinda suck explaining things, but I guess it is just a Difference mask, like when you do a Luminosity mask or shadow mask...

Last edited by Boneappetit; 04-09-2011 at 04:11 PM.
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Old 04-09-2011, 06:00 PM
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Re: Difference layer mask

Hm, use the "Image"-"Calculations", enter the channels you want to compare and choose "Difference" as the blending mode?

I'm not sure what you mean though, this is pretty much a guess ;-)
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Old 04-09-2011, 06:10 PM
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Re: Difference layer mask

Quote:
Originally Posted by Boneappetit View Post
I kinda suck explaining things, but I guess it is just a Difference mask, like when you do a Luminosity mask or shadow mask...
The blending mode difference will show different things with different layers.

I guess you can always do a stamp of what you get when blending, then selecting the luminosity of the RGB channel and creating a luminosity mask of the difference blending mode results - after that you get rid of all the steps, you could create an action that does it for you

Is that what u want?

x
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Old 04-09-2011, 07:09 PM
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Re: Difference layer mask

Natalia and Jonas, thanx a lot guys, I can pick a bit of what you both wrote, I guess that this "Difference mode" is not something we use too often in Ps... Perhaps my question is not the correct one, I know how to do a Luminosity mask, I just wrote that there as a comparison. What I meant was: Is there a process to create a "Difference Mask" or if the Difference blending mode could be used on a mask? The purpose is to "darken" things or create ambient density.

Natalia: Lo voy a escribir en Español para ver si me puedo explicar mejor... Solo quiero saber si el modo de fusion (Difference) puede usarse en una mascara, o si solo tiene el proposito de usarse como blending mode? Se que la pregunta es rara ya que no he visto a nadie utilizar un Difference Mask. El proposito es crear densidad en la foto, en el ambiente de la foto mas bien...

Thanx again guys...
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Old 04-09-2011, 08:40 PM
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Re: Difference layer mask

No worries guys, i just found an old thread on the same theme, very tricky thou... I will also check both of your advises. Thanx

http://www.retouchpro.com/forums/pho...ence-mask.html
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Old 04-10-2011, 03:51 PM
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Re: Difference layer mask

Quote:
Originally Posted by Godmother View Post
The blending mode difference will show different things with different layers.

I guess you can always do a stamp of what you get when blending, then selecting the luminosity of the RGB channel and creating a luminosity mask of the difference blending mode results - after that you get rid of all the steps, you could create an action that does it for you

Is that what u want?

x
Gracias una vez mas Natalia. Esto funciono perfectamente. Me faltaba la parte del Luminosity mask, lo trate y me gusto el resultado. Para ser honesto no entendia el difference mode, y lo estaba tratando de usar como cualquier otra mascara. Tambien aprendi que lo puedo usar de otras maneras en conjunto con el blur para crear otros efectos, etc. Creo que entendiste mi pregunta, mejor que yo mismo, jejeje...
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Old 04-10-2011, 04:12 PM
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Re: Difference layer mask

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Originally Posted by Boneappetit View Post
Gracias una vez mas Natalia. Esto funciono perfectamente. Me faltaba la parte del Luminosity mask, lo trate y me gusto el resultado. Para ser honesto no entendia el difference mode, y lo estaba tratando de usar como cualquier otra mascara. Tambien aprendi que lo puedo usar de otras maneras en conjunto con el blur para crear otros efectos, etc. Creo que entendiste mi pregunta, mejor que yo mismo, jejeje...

Leyendo el otro thread no encontre la utilidad para hacer esto.
Vos si?

x
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Old 04-10-2011, 04:35 PM
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Re: Difference layer mask

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Originally Posted by Godmother View Post
Leyendo el otro thread no encontre la utilidad para hacer esto.
Vos si?

x
Tampoco yo lo encontre, decidi hacer lo que me habias recomendado y funciono... El difference mask como tal solo se puede hacer en After Effects. En Photoshop se usa el Blend Mode de otras formas, con diferentes exposiciones, o con el blur filter... Si deseas puedes ver este video, el cual encontre muy interesante... http://www.youtube.com/watch?v=zolWLMHUd94
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