Random blend mode

[Geppetto Luis]

I would like to use the randon blend mode method on the selected level

I put this together

var blendModes = [BlendMode.NORMAL, BlendMode.SCREEN, BlendMode.MULTIPLY, BlendMode.OVERLAY];
blendMode = Math.random();

where am I wrong?

[pixxxelschubser · Accepted solution]

Try

blendMode = blendModes[Math.floor(Math.random()*4)];

Have fun

[Geppetto Luis]

I tried but it does not work

this and what I did.

var blendModes = [BlendMode.NORMAL, BlendMode.SCREEN, BlendMode.MULTIPLY, BlendMode.OVERLAY];
blendMode = blendModes[Math.floor(Math.random()*4)];  

[pixxxelschubser]

add alert(blendMode)

[varDale_undefined]

Don't forget to set it to a layer

var blendModes = [BlendMode.SOFTLIGHT, BlendMode.SCREEN, BlendMode.MULTIPLY, BlendMode.OVERLAY]; 

activeDocument.activeLayer.blendMode = blendModes[Math.floor(Math.random()*4)]; 

[Polycontrast]

I run the snipt and it works well. Is it posible to chenge the random method to cycle the blend modes in sequential order?

[Chuck Uebele]

Take out the Math random Spartans just loop through the array.

[Polycontrast]

I am not sure what the spartas are. When I remove the *4, or the Math.random() method, the script does not run.

How do I remove the Math random spartans?

var blendModes = [BlendMode.SOFTLIGHT, BlendMode.SCREEN, BlendMode.MULTIPLY, BlendMode.OVERLAY];

activeDocument.activeLayer.blendMode = blendModes[Math.floor(Math.random()*4)];

for (var i=0; i<blendModes.length; i++)

{

alert(activeDocument.activeLayer.blendMode);

}

[Chuck Uebele]

If you just loop through the blend modes on the same layer, all you will get is the last blend mode, when the script is done. What do you want to do? To select a particular band mode in your loop you want:

activeDocument.activeLayer.blendMode = blendModes[i];

[Polycontrast]

Thanks for your help! I am trying to loop throug the blend modes in the array to toogle between the Normal and Multiplie blend modes.  When the script runs,  it sets the active layer blend mode to NORMAL if it is MULTIPLE. And NORMAL if the active layer blend mode is MULTIPLE. 

Do I need a conditonal satament to check the acltive layer blend mode?

var blendModes = [BlendMode.NORMAL, BlendMode.MULTIPLY];

activeDocument.activeLayer.blendMode = blendModes[i];

for (var i=0; i<blendModes.length; i++)

{

alert(activeDocument.activeLayer.blendMode);

}

[Kukurykus]

It's better if you said at beginning what you exactly wish:

aL.blendMode = (bm = BlendMode)[({NORMAL: 'MULTIPLY', MULTIPLY: 'NORMAL'})
[unescape((aL = activeDocument.activeLayer).blendMode).split(bm + '.')[1]]]

[Polycontrast]

I undesrstand the snipe only works when the layers are in NORMAL and MULTIPLY blend modes.

When I try to change the blend modes to NORMAL and COLOR I get an error alert.

Error: Invalid enumartion vlaue

What needs to change on the code so that the it works with the NORMAL and COLOR  blend modes?

[Kukurykus]

COLORBLEND

[Polycontrast]

Thanks for your quick response. This is not working in a mac system.  Am I missing something?

aL.blendMode = (bm = BlendMode)[({NORMAL: 'COLORBLEND', COLORBLEND: 'NORMAL'})

[unescape((aL = activeDocument.activeLayer).blendMode).split(bm + '.')[1]]]

[Kukurykus]

I tried it in CS6 and PS 2020 on no background layer. Maybe change unescape to String, and use one line of that code instead of current two. Set layer to Normal or Color blend mode.

[Polycontrast]

Do you mean one continuous line for the code instead of two lines?

aL.blendMode = (bm = BlendMode)[({NORMAL: 'COLORBLEND', COLORBLEND: 'NORMAL'})[String((aL = activeDocument.activeLayer).blendMode).split(bm + '.')[1]]]

[Kukurykus]

Yes. Didn't multiply / normal version work for you?

[Polycontrast]

Got it I wanted to make ssure I undesrtand what to do. The code works with the String change in PS2022 Tested succesfully with diffrent blend mode pairs. Many thansk for your generous help!

[Polycontrast]

Thank you! The last snipet works well when the active layer is in Normal or Mutiple mode.

[Kukurykus]

That's right. There had not to be other blendings, so it works only for these two.

[Kukurykus]

Can you tell me if this solution works on Macintosh: May 31, 2021

[Kukurykus]

bm = ['NORMAL', 'SCREEN', 'MULTIPLY', 'OVERLAY']; while(bm.length)
	activeDocument.activeLayer.blendMode = BlendMode[bm.shift()]

[Polycontrast]

This snipet does not work on Mac system. It chenges the blend mode of the active layer from Normal to Overlay and persits in Overlay.

[Kukurykus]

So as intended due to your original description before specifying what you exactly need.

A working code for you is the other I left later. As to Mac I asked of code in linked topic.