Gallery designers! I have a question.
 

I am trying to make some nice & smooth gallery templates in photoshop.

The problem is that at the end I get some slices that are too big (file size).

What kind of output settings do you use? GIF, JPG...anything else?

make it a lower quality.

Just play around with it. It all depends on what type of image, and what exactly the image is ( thumb, header, flashing gif, ect )

File > Save for web .. this will allow you to reduce the filesize and see the quality degradation as you change it and before you save it out. Gif and jpg are typically assigned on output.

gif and jpeg

imageready ownz

You should use jpg for the thumbs (save them at a medium/low quality) and gif for the slices with text or flat colors (reduce the number of colors as much as you can, to get a smaller file size), then of course gif for the animated slices. I asume your slicing them in Adobe Image Ready, so you can use different output settings for each slice.
Good luck! :)

yep good point. and adding to that, try using flat web safe colors in your templates, the file sizes would reduce greatly.
I used 32 - 64 color setting on gif depending how complex the colors is. and 30 - 60 quality on the jpeg. i used 60% quality on the important slices like the face of the models. :thumbsup