I just made a prom-shirt of my class. Here's how it looks:
Am I able to change the black color of these into another color, like blue "in a single click" Thank you in advance :)
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Since you didn't specify application here's how you do in Photoshop.
Image 1: Described setup
You can now double click on the color fill layer, Photoshop will open a color picker dialog to change the color.
Image 2: Change color by double clicking on Color Fill 1
You could do same in GIMP, imageMagick you name it.