resolution

I have canon 20D.
I use photoshop CS v8.
I am trying out Genuine Fractals.
Now I can increase resolution and make a 40x25 image with 350 resolution - looks nice too.
But pixel dimensions is 343.5M. Is this too huge??
I am working on images for dancers who eventually want to make posters out of them.
I am still learning photography, so, please be patient with the questions I have ...

That's too huge for most places.. Convert it to JPG.

?? Convert into JPEG?
What does that mean?
Or did you mean if I convert my huge tiff tile into Jpg, it'll be too big??

What would be an ideal (or common) size for bigger printing??

SA935 wrote in post #2604543
?? Convert into JPEG?
What does that mean?
Or did you mean if I convert my huge tiff tile into Jpg, it'll be too big??

What would be an ideal (or common) size for bigger printing??

In photoshop open your picture, and then go to File -> Save As and as the file type choose "JPEG". Then chose the quality level appropriate, 10-12 is probably good for printing. Then save the file.

I've printed a few large prints and I don't think I've ever had more than a 25MB JPG.

Okay, I'll try it.
Thank you very much!