/sci/ - Science & Math

[Anonymous No.2887849]

Hay /sci/.
How do I get into a jpeg.
I want to manipulate a pic on a very basic leven, fuck up the colors ect. (using java or pythong, or whatever.)

pic related: it's a .jpg

[Anonymous No.2887852]

matlab

[Anonymous No.2887853]

It's quite difficult. Ever seen Tron?

[TriforceGuy !!NgyLb1SbqSs No.2887864]

You need to be a pixle. Only pixles get to go in jpegs brah.
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[Anonymous No.2887866]

Molly used to be so hot back in the day.

[Krakengineer !!5XY+x7grkpt No.2887876]

javax.imageio.plugins.jpeg

[Anonymous No.2887877]

>>2887852
?
really?
how?
I can into matlab, but I don't see how I would access a jpg that way

>>2887853
I lol'd :)

>>2887864
...

>>2887866
Are you anyones favorite person?

[Anonymous No.2887878]

Never done it myself, but this should do it I think:

1) Study the .jpg file format (this, I think: http://en.wikipedia.org/wiki/JPEG_File_Interchange_Format))
2) Open the file in a hex editor. (Once you figure out what to do, automating it with a script should be simple)
3) Figure out the offset of the image data, change one byte in the color information.
4) Try to open the file to check that it worked.

[Anonymous No.2887883]

Hello and good Thursday April 14th. I'm Molly and this is Rocketboom.

[Anonymous No.2887885]

Also, be sure to investigate the .gif and .png formats to see if they're perhaps simpler to screw with.

[Anonymous No.2887891]

>>2887876
thx. It looks a bit complicated but I'll look into it

[Anonymous No.2887895]

Use an API to load the JPG as a bitmap. Don't alter it at the JPG format level, that is silly.

[Anonymous No.2887921]

JPG data is transformed and compressed. You can't just change a pixel by editing a few bytes in the file.

[Anonymous No.2887929]

>>2887921
okay, so I should go with BMP then, right?

[Anonymous No.2887935]

>>2887929
Yes, that's one of the easier formats.