removing evidence of a photoshop edit

wl2ider · Joined: 29 Dec 2007 Posts: 4

hi. aid me in a bit of sneakiness here.

if a photo (jpeg) has been edited in photoshop, is there a way of finding out? if so, how does one prevent that? haha. i've heard of EXIF data and IPTC comments, but i'm not sure what to make out of them.

thanks for the help!

Raven12388

i think if you just uplaod it to the internet then save it back to your computer that should take all the info off the image but im not 100% sure

wl2ider · Joined: 29 Dec 2007 Posts: 4

nope, that doesn't work...

Raven12388

ok to get rid of one of the things you mentioned this links may help

http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00Dy2C

try saving it as a png24 using web save then opening the png and saving it as jpg again
just a guess

is there person your being sneaky with image expert would they know if it had been edited??

jerryb · Joined: 16 Apr 2008 Posts: 19

Hi,
well I am no exert on this... but this is what i know...
1. some formats do record what program that there made/created in... using a different program other than photo shop, like irfanview or mspaint, xnview ,etc to convert the file ... a way to change the origination, if the program does it....
2. with jpg, it appears when a file is saved as a jpg using a adobe product, the word "adobe" is put in the header of the file!!!! and using a regular graphic viewer/conversion program that I listed above , when resaved using those programs eliminate the word adobe...

note: if you use your text editor or word processor and just open the jpg file as a text file... at the top (that your header file info area) you will see the word adobe, generally on the first line,,, if the jpg file was saved using ps ...

Etheryte · 100+ Club Joined: 16 Mar 2008 Posts: 116 Location: Estonia

You can not remove evidence of a photo being edited. I won't go into detail, but You can't.
And no, none of the above ideas would work, if a professional with the right resource targeted your image.

wl2ider · Joined: 29 Dec 2007 Posts: 4

just for curiosity's sake, do go into detail..
but yes, i think i agree with you. tweaking stuff like levels causes loss of information, which can be seen on the histogram. sharpening can also be obvious..
hm.. however, one would think one should be able to get away with it somehow..

Etheryte · 100+ Club Joined: 16 Mar 2008 Posts: 116 Location: Estonia

I won't go into detail only because explaining this in general would first require me to explain a dozen other things and in conclusion would be very long and time consuming.

jerryb · Joined: 16 Apr 2008 Posts: 19

hi again,

like i mentioned if it just to get rid of any embeded info that related to photoshop... there ways... if nothing else you could do screen capture and then convert it to a jpg file......(don't use photo shop.. smiling)

but like what was previously mentioned... if it to make a fake image look real that is a lot harder to conceal....
1. first the picture needs to look natural to the avg person.... if it not then is supcious, then people with sharp eyes and knowledge will look at the image more closely!! and on closer pixal examination it can be seen that it been "photoshop" either because of small tell signs with luminocisty or shades near edges etc....
2. this site i think will give you an idea of bad photoshoped image by experts.. smile... http://photoshopdisasters.blogspot.com/ on the surface give expert suspicon it been photoshopped...

another example was a award winning photographer out of china.... great photograph and at first no one question the authenticity of it ,, looked real and natural , the guy did a oustanding job of photoshoppping it...!!! but some one notice a problem with animals... then people looked closed and discovered it was photoshopped..... smiling...
3. like Etheryte mentioned it really a very lengthy subject on how one can tell a fake image.... and i am no expert on this.. but i found a webpage that goes into a lot of details on how identify a fake...

http://oemagazine.com/fromTheMagazine/jan05/photofakery.html

now... i believe that if someone really know what there doing... and is willing to put in a lot of time and money... they may be able to make a fake imagery that can't be detected...

well anyway that my 2 cents worth hope it usefull