Using image stim on scaled screen

Coding
1

Hi,

I am using the credit card code for screen scaling from Wakefield Morys-Carter / ScreenScale · GitLab. I can use it to create a square to place my stimuli on which becomes perfectly square. However, when I try to put my stimuli on the square (which are perfect circles generated in MATLAB) they get distorted into slight ovals. I am not using the builder, but using coder to upload my photos. Has this happened to anyone else? Or any ideas on how to fix the issue? Thanks!

2

  1. What are the native dimensions of your circle image?

  2. What size are you putting in the image component?

3

  1. The native dimensions of my image are 250x250 pixels

  2. The size I am putting in my image component is size = (0.07,0.07)

i am using norm as my window size setting, but it’s weird that it still wouldn’t be a circle given the perfect square generated by the card scaling

Am I not setting the size to (0.07,0.07), but actually setting it to 7% of the screen because it is in norm? Thanks!

4

To use screen scale you need to multiply the desired size in cm by the scaling factors, e.g. (2 * x_scale, 2 * y_scale)

You are currently using 7% of the screen dimensions.