can anyone explain why when using photoshop cs on my powerbook i cant save files as jpegs?

the only options i have are: photoshop, photoshop rdf, photoshop raw or tiff. i cant import jpegs either.

basically jpegs seem to be a no go.

can anyone explain why when using photoshop cs on my powerbook i cant save files as jpegs?

the only options i have are: photoshop, photoshop rdf, photoshop raw or tiff. i cant import jpegs either.

basically jpegs seem to be a no go.

Most likely it is because your file is 16 bits and jpeg only supports 8 bits. In Photoshop, try doing "Image" "Mode" "8 bits/channel" and then saving the file a a jpeg.

Like kdvsn said, it sounds like you're working with 16-bit images. If you can't import though, something else is going wrong.

As for saving the jpgs, you should use "Save for Web", then choose jpeg and use a quality of 51% or better. 50% or lower will show compression artefacts on the edges of areas with high color saturation.