Hiding Layers

[creekrobber]

Hello All. Sorry for the cross post in forums. I'm a detective in Tennessee and need a little help. I work on computer forensic investigations and I am currently working a case where there is evidence that a person has possibly hidden an image using Photoshop, Gimp, or something. The things I need to know is what image format do I need to be looking for? There were no .psd's on the hard drives but what other formats? Can a .bmp, .,jpg, or .png for example be manipulated with layers, masks, or anything else to conceal an image. Also, I am not a big photoshop user but I need to investigate this further. I will be using Gimp. What would be the process of importing an image and showing the layers. I have tried but failed miserably in working with layers, trying to show different layers, etc. HELP PLEASE.

Thanks

Chad

 

[qwerty]

Hi,
you can open tiff and pdf files with layers in Photoshop. you can take a look :

Graphics Fundamentals: Understanding Photoshop File Formats | CreativePro.com

S

 

[Paul MR]

It gets worse! besides having visibility turned off on some layers (not JPG) you need to be looking at the embedded thumbnails within the files.
One of the best tools around is "ExifTool"
ExifTool by Phil Harvey
With this tool you should be able to extract the thumnails.
Good luck you will need it!