I am performing a render on a scene through the viewport using f12 option and saving the rendered image but when viewing the two images side by side I've noticed that the colors are much sharper in the view port with higher contrast. This is especially noticeable on red and green objects.
I am using the default color management options and sRGB color space. Is this difference in color caused by some interpolation when converting the rendered view port image to a png format?
I am on Linux Ubuntu 16.04 and opening the image on Gnome Image viewer.