condition with pick color

[jokerbot]

Hi guys, i newbie in scripting and need you help, i have create this structure, but i can't realize this on javascript:
- for example we have image 800x600(px) with absolutely black line in bottom(15-30px), but some image don't have this line, and i want create condition;
- if (black_line -> true) {some function} else {some function};
- (black_line -> true) i think we can realize this with color picking on bottom.

If you have some ideas please help.
Sorry for my bad english.
ps: Thanks

[Michael_L_Hale]

A few questions,

Which version of Photoshop are you using?

Where is the black line? At bottom 15-30px tall or 15-30px from bottom?

How thick is the black line?

Is it on it's own layer? If not there do you want a layer?

[jokerbot]

Which version of Photoshop are you using? -> CS2, also have CS4

Where is the black line? At bottom 15-30px tall or 15-30px from bottom? -> on screen

How thick is the black line? -> on screen

Is it on it's own layer? If not there do you want a layer? -> i use jpg files without layers

[Michael_L_Hale]

function hasBlackBottom( thickness ){
     var doc = activeDocument;
     var w = doc.width.as('px');
     var h = doc.height.as('px');
     var t = new Array( new UnitValue(0,'px'), new UnitValue(h-thickness,'px'));
     var r = new Array( new UnitValue(w,'px'), new UnitValue(h-thickness,'px'));
     var b = new Array( new UnitValue(w,'px'), new UnitValue(h,'px'));
     var l = new Array( new UnitValue(0,'px'), new UnitValue(h,'px'));
     doc.selection.select([t,r,b,l]);
     return !!!doc.histogram.toString().match(/,[1-9]/g);
}
if( hasBlackBottom( 15 )){
     // code to deal with black line at bottom;
     alert('has black bar at bottom');
}else{
     // code to deal with missing black line;
     alert('No black bar at bottom');
}

[jokerbot]

it's really work, but some images have troubles(look screen)

Can we check just little area of bottom line?

[Paul Riggott]

Here's a quick modifcation to Mike's code..

function hasBlackBottom( thickness ){
     var doc = activeDocument;
     var w = doc.width.as('px');
     var h = doc.height.as('px');
     var t = new Array( new UnitValue(w-50,'px'),new UnitValue(h-thickness,'px'));
     var r = new Array( new UnitValue(w,'px'), new UnitValue(h-thickness,'px'));
     var b = new Array( new UnitValue(w,'px'), new UnitValue(h,'px'));
     var l = new Array( new UnitValue(w-50,'px'), new UnitValue(h,'px'));
     doc.selection.select([t,r,b,l]);
     return !!!doc.histogram.toString().match(/,[1-9]/g);
}
if( hasBlackBottom( 15 )){
     // code to deal with black line at bottom;
     alert('has black bar at bottom');
}else{
     // code to deal with missing black line;
     alert('No black bar at bottom');
}

[Michael_L_Hale · Accepted solution]

If you just want to check 10px X 10px bottom right

function hasBlackBottomRight(){
     var doc = activeDocument;
     var w = doc.width.as('px');
     var h = doc.height.as('px');
     var t = new Array( new UnitValue(w-10,'px'),new UnitValue(h-10,'px'));
     var r = new Array( new UnitValue(w,'px'), new UnitValue(h-10,'px'));
     var b = new Array( new UnitValue(w,'px'), new UnitValue(h,'px'));
     var l = new Array( new UnitValue(w-10,'px'), new UnitValue(h,'px'));
     doc.selection.select([t,r,b,l]);
     return !!!doc.histogram.toString().match(/,[1-9]/g);
}
if( hasBlackBottomRight()){
     // code to deal with black line at bottom;
     alert('All black at bottom right');
}else{
     // code to deal with missing black line;
     alert('Non black colors at bottom right');
}

[jokerbot]

Thank you my friends, it's all really work.