Incompatible JPEG Format

[Woodstudio]

I put the CF card into a reader and read the images direct from the card. Usually I just copy them to my computer.

Sometimes I adjust contrast and color with PhotoShop and resave the image back to the CF card. I don't mess with size or number of colors. How come the camera can no longer display an enlarged image of the modified picture on the small screen, but does display a very tiny one? It also says "Incompatible JPEG Format."

Is there an easy way to modify the picture and upload them back to the camera?

I know this isn't the way Canon invisioned it to be done. Thanks for any suggestions.

[ken-w]

woodstudio wrote:
Sometimes I adjust contrast and color with PhotoShop and resave the image back to the CF card. I don't mess with size or number of colors. How come the camera can no longer display an enlarged image of the modified picture on the small screen, but does display a very tiny one? It also says "Incompatible JPEG Format."


I don't know for sure but I suspect the reason is that Photoshop doesn't support EXIF JPEGs which is what the Canon (and most other current digital cameras) produces. When you load the image into Photoshop and resave you strip it of the EXIF data so the camera no longer recognizes it as one of its files.

Just a guess.

[Woodstudio]

After some research, I found out that Canon uses a JPEG 2000 format (or J2), which Photoshop doesn't support. All I had to do was open the modified original in IrfanView (a freeware program) and save it. Irfanview supports JPEG 2000 format.

These jpgs display on the camera LCD, but the mini thumbnail view displays a ? question mark. I would rather have the larger LCD image than the thumbnail anyways.

Oh well......