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Thread 106373269

34 posts 20 images /g/
Anonymous No.106373269 >>106373606 >>106373643 >>106373841 >>106374286 >>106374775
Reminder to re-encode your 4chan images to wipe any embedded data.
Anonymous No.106373369
>dancingswede.mp4
Anonymous No.106373402
write a userscript to do that for you
Anonymous No.106373601 >>106373811 >>106373861
if I search pepe meme on search engine and I copy from some meme website do I risk it having data in it? how tf do I even know?
Anonymous No.106373606 >>106373811 >>106373861 >>106373948
>>106373269 (OP)
>re-encode
How? Do GIMP or imagemagick help?
Anonymous No.106373643 >>106373861 >>106374367
>>106373269 (OP)
how do you do that?
Anonymous No.106373811 >>106373831
>>106373606
You can do this with magick

for img in *.jpg *.png; do
magick "$img" -strip -quality 85 "${img%.*}.jpg"
done


I'm not sure it's guaranteed to wipe all embedded data. In theory the lower you set quality the more likely data will be wiped.

>>106373601
I don't think there is any guarantee with any images. 4chan images are riskier because there is a userscript for embedding images and viewing them easily.
Anonymous No.106373831
>>106373811
Also that magick command will lower your image quality so be careful about that if it matters to you. Some say they don't notice visual difference until going below 40. It depends on the type of image also and how much you zoom in. it
Anonymous No.106373841 >>106373870
>>106373269 (OP)
ah shieet, 4chan doesn't clear metadeta by itself ? pathetic
Anonymous No.106373851 >>106373870
I only take screenshots of images tho
North !!CVHbZmcS6Ao No.106373861
>>106373606
>>106373643
https://stylesuxx.github.io/steganography/
>>106373601
Use this one. It also doesn't have the datamining strips, that originated from this BBC article:
https://www.bbc.com/news/world-us-canada-37493165
Anonymous No.106373870 >>106373911 >>106373926
>>106373841
OP didn't say metadata faggot
>>106373851
then you're preserving the encoded data
North !!CVHbZmcS6Ao No.106373893
This one should say "hello 4chan"
Anonymous No.106373911
>>106373870
What if I mess up my alignment and don't get the full image?
Anonymous No.106373926 >>106373952
>>106373870
i see, so why else would i do something autistic as reconding the fucking images ? whats the worse that could happen ? there is some cp hidden inside or what ?
Anonymous No.106373946
would screenshot the picture work or is it in the pixels?
Anonymous No.106373948
>>106373606
Anonymous No.106373952 >>106374053
>>106373926

its just another way to fingerprint and make cross-correlating connections.

its not much, but its another datapoint that could be forensically used.
North !!CVHbZmcS6Ao No.106373953 >>106373955 >>106374002
https://incoherency.co.uk/image-steganography/#unhide
Anonymous No.106373955 >>106373959
>>106373953
>co.uk
I'm not clicking that
Anonymous No.106373959 >>106373982
>>106373955
It's a fucking top level domain and it's probably not hosted in the UK anyway are you this retarded
Anonymous No.106373982
>>106373959
nice try mi6 glowie
Anonymous No.106374002
>>106373953
>co.uk
Feminazi domain, nice try Karen.
Anonymous No.106374053 >>106374258
>>106373952
damn, now i gotta make script that will embed "op is faggot" into image binary to use everytime before I post something here
Anonymous No.106374258 >>106374587
>>106374053
echo "op is a faggot" >> faggot.jpg
Anonymous No.106374286 >>106374301 >>106374304
>>106373269 (OP)
mind you autists help cure my schizo. several years ago i made this image https://archive.4plebs.org/x/search/filename/michael-16a.gif/ i compressed it close to the 4chan image limit and managed to uploaded it

however i download it from 4plebs and try to upload it here i get image limited

it looks to me like 4chan added data to my image, could it be malicious, or is there a reasonable explanation?
Anonymous No.106374301
>>106374286
on the same board too, no luck, direct download from 4plebs
Anonymous No.106374304 >>106374324 >>106374337
>>106374286
Apparently the tool 4chan uses to strip metadata from images causes images to increase in size sometimes. I've seen it happen to my images too.

https://desuarchive.org/g/thread/106363393/#106363795
Anonymous No.106374324
>>106374304
>https://desuarchive.org/g/thread/106363393/#106363795
thank you anon.

does this reencoding have implications for steganographic pixels?
Anonymous No.106374337
>>106374304
though i'm concerned this blocks before upload, mine made it onto their server severaltimes, and its still fetchable, just it cant be uploaded anymore

have to find the original see if i can post it fresh
Anonymous No.106374367 >>106374425
>>106373643
>open image in mspaint
>select all
>copy
>close image and create new
>paste
>save
Anonymous No.106374425
>>106374367
>load
>check
Anonymous No.106374587
>>106374258
this doesn't work 4chan stripped the extra data, second attempt
truncate -s -2 faggot.jpg
echo -en "op is a faggot\xFF\xD9" >> faggot.jpg
Anonymous No.106374775
>>106373269 (OP)
You mean from the the image that I am uploading that I previously downloaded from 4chan earlier that day?