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When using "Export as image" function there are currenty 3 output formats: JPEG, PNG and SVG. JPEG is chosen as the default one, which is a bad principle and quite an annoyance. For computer graphics a lossless format should be always chosen as default. JPEGs are good only for photos, everything else looks extremely ugly, especially computer graphics like screenshots or exported images. Most of the users certainly must switch to some more reasonable format everytime they want to export the diagram (it remembers the choice, but only for some very little extent). It's really tiresome and should be fixed. SVG offers to be a best choice by being a vector format, unfortunatelly on mainstream Windows systems there is a very poor support (ok, let's say none) for vector images. PNG would be an acceptable compromise between image quality and ease to use.
In 6.5 the default image format is PNG.
verified in nb 6.5 trunk build 20080723145315 that PNG is now the default format.