Hi, some book readers on ipad have an option to make the screen Sepia Tone. This makes the color of the screen warmer and less strain and stress on the eyes.
Sepia tone option would be good and wont effect the images very much.
Hope you consider this, my eyes would thank you!
Thank you.

Thank you for using ComicGlass!
Since the filter of sepia is made comparatively simply, I would like to implement from now on.

Thank you

Thank you for your reply! I look forward to sepia image filter.