> For the complete documentation index, see [llms.txt](https://alham-rizvi.gitbook.io/alhamrizvi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://alham-rizvi.gitbook.io/alhamrizvi/picoctf-writeups/picoctf/forensics/advanced-potion-making.md).

# advanced-potion-making

after analyzing this file i found that the hex is wrong, its in png format but corrupted

<img src="https://github.com/user-attachments/assets/7828ddc3-a6d4-4c97-a5eb-277eaf835443" alt="image" height="768" width="1366">

after checking this, we have to fix the headers of image to get correct png file, we can use any hex editor like hexeditor, hexyl, xxd or ju8st use a python script,

<img src="https://github.com/user-attachments/assets/fb9eb381-cf79-4718-a7ee-d731773519c8" alt="image" height="600" width="791">

```
alhamrizvi@alhams-fedora:~/Downloads$ python3 -c "with open('advanced-potion-making', 'r+b') as f: f.write(bytes([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]))"
alhamrizvi@alhams-fedora:~/Downloads$ pngcheck -v advanced-potion-making
File: advanced-potion-making (30372 bytes)
  chunk IHDR at offset 0x0000c, length 1184532:  EOF while reading data
ERRORS DETECTED in advanced-potion-making
alhamrizvi@alhams-fedora:~/Downloads$ python3 -c "with open('advanced-potion-making', 'r+b') as f: f.seek(8); f.write(bytes([0x00, 0x00, 0x00, 0x0D]))"
alhamrizvi@alhams-fedora:~/Downloads$ pngcheck -v advanced-potion-making
File: advanced-potion-making (30372 bytes)
  chunk IHDR at offset 0x0000c, length 13
    2448 x 1240 image, 24-bit RGB, non-interlaced
  chunk sRGB at offset 0x00025, length 1
    rendering intent = perceptual
  chunk gAMA at offset 0x00032, length 4: 0.45455
  chunk pHYs at offset 0x00042, length 9: 5669x5669 pixels/meter (144 dpi)
  chunk IDAT at offset 0x00057, length 30265
    zlib: deflated, 32K window, fast compression
  chunk IEND at offset 0x0769c, length 0
No errors detected in advanced-potion-making (6 chunks, 99.7% compression).
alhamrizvi@alhams-fedora:~/Downloads$ xdg-open advanced-potion-making
```

then i figured out that the png file has nothing but just red background, i found this tool <https://www.online-image-editor.com/>

change image color > B\&w


---

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