Remove Empty channel

Forum|Forum|16 years ago
January 22, 2010
3 replies
3307 views

Dear all,

Is there any scripting to remove Empty channel from the Channel palette.

Actions and scripting

This topic has been closed for replies.

Correct answer Paul Riggott

Here is an example for RGB or CMYK documents.

//Only RGB or CMYK documents
main();
function main(){
if(!documents.length) return;
var doc = activeDocument;
var PixCount =doc.width.as('px') * doc.height.as('px');
var CH=[];
var ChCount =0;
if(doc.mode == DocumentMode.RGB) ChCount =3;
if(doc.mode == DocumentMode.CMYK) ChCount =4;
if(ChCount == 0) return;
for(var a = ChCount;a<doc.channels.length;a++){
 CH.push(doc.channels.name);
}
for(var a in CH){
 doc.channels[CH].visible=true;
//if (doc.channels[CH].histogram[0] == PixCount)doc.channels[CH].remove(); //Black Channel
if (doc.channels[CH].histogram[255] == PixCount)doc.channels[CH].remove();//White Channel
else doc.channels[CH].visible=false;
 }
}

Stephen Marsh

Community Expert

The code posted in this topic no longer works. A related topic with working code here:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/check-if-channel-have-pixels-or-not-script-code/td-p/13061347

H

hubertj40734033

Participant

Hi, I work with many spot colors and CMYK in multichannels mode. I would like to delete empty channels from CMYK.

Some artworks have a filling only in C and M, and an additional 8 spot colors - I would remove the Y and K,
and other artworks to fill the CMY and spots - I want to remove then K.

Are rewrite the script goes to work on multichannel mode?

M

Michael_L_Hale

Inspiring

Unlike layers, channels can't be empty. They can be all white or all black. If that is what you want to remove then you could check each channel's histogram to see if the first or last element equals the number of pixels in the document.

A

Anonymous

Yes Right.. To delete only white channels at a time is ther any script..

and thanks 4 de reply

Paul RiggottCorrect answer

Inspiring

Here is an example for RGB or CMYK documents.

//Only RGB or CMYK documents
main();
function main(){
if(!documents.length) return;
var doc = activeDocument;
var PixCount =doc.width.as('px') * doc.height.as('px');
var CH=[];
var ChCount =0;
if(doc.mode == DocumentMode.RGB) ChCount =3;
if(doc.mode == DocumentMode.CMYK) ChCount =4;
if(ChCount == 0) return;
for(var a = ChCount;a<doc.channels.length;a++){
 CH.push(doc.channels.name);
}
for(var a in CH){
 doc.channels[CH].visible=true;
//if (doc.channels[CH].histogram[0] == PixCount)doc.channels[CH].remove(); //Black Channel
if (doc.channels[CH].histogram[255] == PixCount)doc.channels[CH].remove();//White Channel
else doc.channels[CH].visible=false;
 }
}

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