how can i give a jpg burnt edges or vignetting look in photoshop?

Answer 1

If I was going to burn the edges of a Jpeg, like making an old pirate map, a charred scroll, or something similar the simplest way I can think of doing would be the following:

1) Create a new image (the same or larger size than the Jpeg) and set background color to transparent image instead of white.
2) Paste a copy of the "unburnt" Jpeg image in this transparent base layer.
3) Use the lasso tool to select the parts you want to keep, then invert the selection so that it now selects the stuff you want to get rid of and delete them.
4) Create a new transparent layer over the modfied Jpeg. Then do one of the following in this layer:
5a) Use the paint brush to trace a solid line around the shape of the modified Jpeg. Then use the smudge tool to push out and fade the edges on both sides of the line to create the burnt effect. OR
5b) Use serveal passes of the airbush to make the blackened edges.
6) Once it looks how you want it merge the layers (make sure it stays as a transparent background) then save the image.

You should have a "Burnt Jpeg" image that can be applied to other background images.

Hope its what you're looking for.

Answer 2

I guess it depends on what version you have. but in cs 2, I am pretty sure that you can use a filter option to get the burnt edges, to get the sepia color, it might be under a filter to or maybe it is under image and adjustments, but there are around 50 or so different filters to use check them out and get to know each of them