The original for this photo was 3072 x 2048 px and included the entire fly sitting on a leaf. I cropped with the marquee tool to 1000 X 700 px. Any attemp to shrink the file or use ps crop tool to resize it results in significantly diminished detail. I tried converting to .tif and then progressivly shrinking by 10%...same loss of detail. I've never tried programs designed specifically to reduce files. If someone has experience with this please let me know.