Tip #118
...What is layer masking?
Hi, I was just going through your question site & thats great. I am supposed to join as a faculty of photoshop but my color theory of photoshop sp. index color mode & multi channel mode is not clear. Also, what is layer masking. I will appreciate if u could even suggest me a site for learning photoshop. thanks a lot nidhi
Multiple channel question
1) Index Color Mode: this is when the image is mapped to a
specific palette of colors, usually the 215 or 256 color model, in which each color
is a specific index number, and 'inbetweens' do not exist. No interpretation of color
is generated in this mode.
2) Multi Channel Mode: In this mode, Photoshop splits the individual
channels apart and breaks their relationships. Each channel exists independently
within a single image, preventing the "mixing" which makes the full color
image. Usually you use this mode as a conversion step in moving from one mode to
another. RGB to CYMK for example. Generally this mode allows the manipulation of
each individual channel without bothering the others.
3) Layer Masking: this is a loaded question, and we could easily write 80
or so pages on the subject. But let me attempt to boil it down to its essence.
... Each layer in a Photoshop (5) file has an additional
channel called the "Layer Mask". In short, this mask allows you to block
an image from showing through on that layer, or from an underlying layer, or from
the background. It's much like the old fashioned ruby-lith masks we used to make
to block a portion of the image.
... The layer mask button is the icon at the bottom
of the layers palette - the one with the dotted circle. Clicking on this introduces
the layer mask onto the selected layer. Another icon appears to the layer name indicating
the mask is active. Another appears between the thumbnail and the mask thumbnail
(the little chain) which indicates the mask is linked to the layer.
... By setting up a layer mask (shapes, vignettes, typography,
etc) you make those 'masked' pixels transparant. They dissappear from the image.
The value of this is to have a non-destructive method to block parts of the image.
... To modify it, simple paint on the layer (with mask
active) in black. Set type, or even place images.
Beyond that, there are 3 dozen other wiz-bang things you can do with the layer
mask.
I recommend you purchase Deke McClelland's "Photoshop Bible" to learn all
the possibilities of layer masking.
"Photoshop
4 Bible", or "Photoshop
5 Bible"
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