T – shirts are great for fundraising for your charity. This post contains some resources on t-shirt design.
And often (most of time) you will want your shirt design to have a transparent background.
So first if you have a white background on your image, you will need to remove it and save the background as a transparent alpha layer.
This brief YouTube video goes over what all of the above means:
Adding Alpha Channel To Image In GIMP To Make Transparency YouTube 3:04 by Jason Wilkey, Published on Dec 10, 2015.
Another good YouTube Video is What Is Alpha Channel 6:03 by Micky Sains
Published on May 19, 2016.
Here is an explanation on the RGBA Color Space in Wikipedia. The A stands for Alpha Channel.
Here’s a YouTube video, RGBA Color Space (5:15), by Audiopedia. Published on Nov 9, 2015