This looks like you have the Quality and Sampling switch in the Switches column of the Timeline panel set to draft (\ is draft, / is high quality - the default) or the Fast Previews switch in the Composition panel (fourth icon from the right at the bottom of the Composition panel - looks like it has a lightning bolt in it) set to Fast Draft which would turn it blue. It does not look like you have the Magnification Ratio (fourth option from the left in the bottom right) for the Composition panel set to a value higher than 200% because the pixels would be aliased and show different color values on the edges.
We would know for sure if you had not cropped your screenshot so much so we could see the UI. It would also help if we knew which look you were trying to achieve. You could even be looking at pixel preview in Illustrator.