Lemke Software GmbH Forum

Change picture data only, keep all other file data untouched - how?
GraphicConverter 9, Mac

Hello. I've got a very specific problem.

Question:
How can GC change picture data only while keeping the original file format and any non picture data untouched?

File source: Windows Game
Appearance on Mac: Unix exec, no suffix
GraphicConverter info: jpg file

Job:
Transfer file from Windows to Mac
Alter picture data
Save file
Transfer file from Mac to Windows
Replace original file with altered file
Open file ingame

Current problem:
Altered file is not recognized ingame

Thanks for any suggestions

Hi,

a JPEG file does not have to be converted for the Mac.
It just needs the correct extension JPG or JPEG and the macOS will support it.

Thorsten

Thanks for your reply.

I did not say that I want to convert the file.

The job is:
1. to open the original file.
2. to alter the picture data.
3. to save the file without changing any "non picture data."
Is GC able to do point 3.?

I have to assume that GC changes unknown internal file data during the save process.
Why? Because the original application doesn't recognize the altered file.

I hope I have made myself clearer.

Yes, just select in the JPEG options (save as) to save with the Original Exif.

It doesn't work.

Even re-saving the file without any changes result in being not recognized.
So I have to assume there are differences in some kind of file data between both versions.

If you are interested, i can provide you with the original file.

Thanks for your efforts.

Please email your file zipped to support@lemkesoft.de