I am creating an experiment that displays squares of different hues/colours and requires participants to sort them into a continuous gradient based on hue. It is very important that the images, which are being presented as .png images, maintain their correct hue when displayed. I noticed the squares look slightly different when I run my PsychoPy experiment, so I took a screenshot and tested the hue and RGB values of the squares in GIMP (photoshop app). Turns out they have a different hue and RGB value when presented in my experiment.
I thought the change in hue values may be due to the screenshot process, however the squares clearly look different on PsychoPy to and cannot be placed in a nice gradient.
Any ideas why this may be the case and how I can prevent the altering my images? Thanks in advance.