For the redwoods image, the format with the smallest file size was the low quality JPEG at only 43 KB. The greatest file size was the PNG-24, at 861 KB. The highest quality image, in terms of compression and color appeared to be the high quality jpeg. While the PNG may not have had as many compression issues, there were issues with the gradient in the sky. Due to the high quality jpegs image quality and low file size, 147 KB, I would say it is the best option for this image.
gif 32 no dither
For the gradient image, the format with the smallest file size was, again, the low quality JPEG at only 4 KB. The greatest file size was again the PNG-24, at 53 KB. The highest quality image this time was the PNG-24, with no issues in terms of color, compression or gradient. While the jpegs were smaller files, they showed many compression artifacts around the border of the circle. However, the high quality jpeg's compression artifacts are hardly noticeable at a small scale. Overall though, I would say that for a picture this simple, the PNG was the best choice.
gif 32, no dither
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