Good opensource photo editing software to reduce image file size?

Dear EE members,
I want to reduce image file sizes of all photos in a folder in one shoot, how to do this without losing the photo quality while file size has been reduced greatly.


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Without losing quality? you only option is Compression then. Any changes to it to lower the size would redue its quality
yjchong514Author Commented:
if the software can scale down the photo size for photos in one folder in one shoot,then it is okie.
Try Irfan View( its a good image viewer with some neat editing options too.
Its got a batch conversion option where you can save in different compressed formats like jpg/gif/png etc.

Picasa ( is also very efficient in compressing image size but still maintaining quality. Not sure if its got a batch conversion facility though.

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