changing lines/shapes to rainbow?

[speedandsleep]

hi,

i am trying to make a set of shirts with different icons. they are currently black but i need them to be rainbow striped. for example, i have a jpg of a map made of up of black lines that i've pasted into my Ps document. i want the lines to be rainbow striped instead of black. the site won't let me post a link to an example.

can anyone help me?

m

 

[ibclare]

Yes, it's easy.

I did 2 hue/saturation adjustment layers. The first one was to desaturate the black and bring up the brightness.

Then I used filter>unsharp mask. This brightens the image and allows the fabric details to be enhanced. Keep the threshold low and heighten the radius and amount. You don't need to convert to smart object. I often do that when I apply a filter in order to remove some of the effects selectively since I will get a filter mask with a smart object.

Finally I made another hue/sat adjustment layer, checked off the colorize box and moved the sliders around till I got a color I wanted.

In the image I've attached, the original black desaturation is on the far right. Note the checkbox that says colorize on the bottom of the other hue/sat panel.

That's pretty much it. Good luck and let us know if you have any questions.

 

[ibclare]

I realize the contrasts may not be enough. You can play with levels or curves adjustments and alter the hue/sat lightness and/or sat if you like. With the levels adjustment, you may want to play with the output adjustments. Brightness/contrast adjustment may also work (depends on the color and so forth) and you can always take a jpeg into camera raw and try out those sliders. You can also use a copy of your original in black, place it at the top of the layer stack and set it to screen. This will lighten the image (you can adjust layer opacity) but also increase contrast. Enjoy!

 

[speedandsleep]

thank you!!