Edit an image BYTE-SIZE

[wolftatoo]

I want to make a modded image the exact bytes-size(not pixel size) of an original one!
How can i do that?
Please help!

[MerlinSVK]

Wow! So much information! Now we can start guessing the format.
First try: PNG?

[wolftatoo]

Yes, i need help on PNG.
I already can increase JPG by editing its EXIF.

[MerlinSVK]

Why you need the exact same file size?
For reimporting back into archive?

If yes, could you use smaller PNG and the rest simply fulfill with zeroes?

• If yes, try FileOptimizer (it has some optimization utils also for PNGs) which could make smaller (byte-wise) PNGs than original
• If no, than there is probably no way to make a new PNG with same size

[wolftatoo]

Actually i found a way to do that by: opening the png in a hex editior and ad spaces to the end till i got the exact bytesize that i wanted(pics still get reconized/read by any programme but the game)
But, the game wont reconize the modded pngs ! Its probably Crc check.
Any ideas?

[MerlinSVK]

I would firstly modify few bytes in the original image, to check if it really has a crc check.
If that's the case, you will have to find where are stored the checksums and modify the one you need.