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January 26, 2021, 12:35:30 PM

Author Topic: PNG Tileset Splitter and more  (Read 613 times)

Offline Derron

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Re: PNG Tileset Splitter and more
« Reply #15 on: January 09, 2021, 04:53:32 PM »
He just wrote about some other "magic" - xor stuff together and then "decipher" again


bye
Ron

Offline Matty

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Re: PNG Tileset Splitter and more
« Reply #16 on: January 09, 2021, 06:57:20 PM »
Yes, sorry Hardcoal, I was just giving a further example for you for the app you described.
I eat cheese in the trees when its eight degrees

Offline Hardcoal

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Re: PNG Tileset Splitter and more
« Reply #17 on: January 20, 2021, 07:04:49 PM »
NP Matty..

I just added a Message inside Image hider..
its not perfect as I desire but its ok for now..
I was boring to do it.. but it was on my to do list.. and I wanted to as well..

Now to more interesting things..

This app atm arent too exciting.. but im planning to add more useful stuff and see where it goes..

off course I do other things at the same time. but its nice to have something you can share..

I did like 10 years of programing or more without even sharing one thing..
It was frustrating and very unsatisfying..

but now Im gonna release small stuff. this should be fun
Lets make the world a better place

Offline DaiHard

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Re: PNG Tileset Splitter and more
« Reply #18 on: January 22, 2021, 09:36:30 AM »
This idea of hiding information in an image is called steganography. The trick of hiding it using the lowest bit(s) is a standard one, but if you invented it yourself, well done!

Because digital images often contain huge numbers of pixels, you can hide pretty long text messages, or even images, using only the bottom bit or two of each pixel (or, I guess, even each colour element of 24 bit images), but decoding them can be a bit painful, since you need to reconstruct a character from several pixels.

I'm quite surprised it works as well as it does using the bottom 4 bits -  but I guess that's only 1/16 of the "brightness" of that colour....

The microdot approach is attractive with physical materials (esp. photos), but probably less so in digital images (for the hidden bit to be visible on zooming but (almost) invisible at "full size" requires a hugely oversampled image).


Offline Hardcoal

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Re: PNG Tileset Splitter and more
« Reply #19 on: January 22, 2021, 01:03:12 PM »
i did came up with that myself.

i did hide images.. as well.. if you check the app.

actually the hiding text which i did is not perfect..
the pixels change is slightly visible at the top left side of the output image
if i really cared. i could make it undetectable.. but im too lazy for that now..
i just did it for experiments reasons..

before i did the image hiding i wasnt certain it will work..

because i never read about image hiding..
i just went straight into programming, for the fun of it
Lets make the world a better place

 

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