How can I change the ISO value on my RAW file?

I want to change the ISO value on a raw file. Are there any programs that will let me do that like a hex editor? How would I go about doing that..?

You cannot.

aw oh well.. I'll have to tell my teacher i accidentally shot 160 ISO. Thanks for the answer though

Or you could lie, if they don't look at exif.

malcolm027 wrote in post #8700930
aw oh well.. I'll have to tell my teacher i accidentally shot 160 ISO. Thanks for the answer though

Maybe im wrong but i think Rene was talking about changing the actual ISO of the image.
You can modify the Exif to show it was shot at a different ISO setting if thats what you are trying to do. At least, i think you can.
Or just strip all the Exif out so nothing is shown. and then lie.

Ok ignore my post. Seems you cant (or at least its not very easy)
Also I didnt see the RAW bit, thought we were talking about .jpg.

I'll get my coat.......

So, to get this straight, your assignment was to shoot at a particular ISO, instead you shot at ISO 160, and you want to doctor the "evidence" to say you shot at the assigned ISO, and you're wondering if you can do this in the Raw file.

It's pretty easy to do it in a jpeg file using a text editor, but a Raw file is harder to decipher without a Hex editor.

I'm pretty sure it can be done with software like EXIFTool but why would you want to do that?

Its reasons like this why Canon has its Data Verification Kit to reveal if any tampering occurred.

malcolm027 wrote in post #8700930
aw oh well.. I'll have to tell my teacher i accidentally shot 160 ISO. Thanks for the answer though

...or don't hand it in and say the dog eat it

What's wrong with ISO 160?

cryforashadow wrote in post #8702751
What's wrong with ISO 160?

Nothing, unless the assignment called for something else

So the teacher will check out the exif of the RAW file? That's one crazy teacher.

Photoshop, Lightroom, DPP and I suppose numerous Raw-capable programs extract/show the Exif from Raw files, so it's easy to check.

I can't believe that so many people are advising the OP to lie!

I don't know that anyone's actually advising him to lie -- in fact, if he was asking for advice, I might tend to say "I shot it at ISO 160, because it is an ISO 200 shot that the camera applied some compensation to, which allowed a faster shutter speed and has less noise than ISO 100!", but then that might confuse the teacher and get him riled up.