Image files in my Google AI Studio app have recently become problematic. The app is connected to a Github repo. Normally when image files are clicked in the Code section they display. Now many show “Media” when clicked. When downloaded individually they do not open, showing “unknown format”. I had AI Studio check file integrity for one of these problem files. I have have reformatted the assessment AI Studio gave so it can be clearly displayed here.
[b]Image File Integrity Assessment[/b]
An assessment of the integrity of [b][REDACTED IMAGE FILE][/b] produced the following findings.
[b]Integrity Assessment Summary[/b]
[code]
Metric / Check Local Workspace File Verified GitHub Version
Status Corrupted Valid and intact
File size 3,325,209 bytes (~3.32 MB) 1,906,561 bytes (~1.91 MB)
Header signature (hex) EF BF BD 50 4E 47 0D 0A … 89 50 4E 47 0D 0A 1A 0A …
Magic-byte identification Raw data / invalid PNG Valid PNG image
[/code]
[b]Root-Cause Analysis[/b]
[b]1. UTF-8 string-encoding corruption[/b]
The standard eight-byte header of a valid PNG file begins with:
[code]
89 50 4E 47 0D 0A 1A 0A
[/code]
This represents:
[code]
\x89PNG\r\n\x1a\n
[/code]
In the corrupted local file, the leading byte [code]0x89[/code], along with other non-ASCII binary bytes in the compressed PNG data stream, appears to have been decoded as text.
Those bytes were then transformed into the three-byte UTF-8 replacement-character sequence:
[code]
EF BF BD
[/code]
This sequence represents the Unicode replacement character:
[code]
\uFFFD
[/code]
[b]2. File-size inflation[/b]
The text-encoding conversion expanded binary sequences throughout the file. This increased the file size from approximately 1.91 MB to 3.32 MB.
The altered file is no longer a valid PNG and cannot be parsed correctly by web browsers or image-viewing software.
[b]3. Upstream source verification[/b]
The original version of [b][REDACTED IMAGE FILE][/b] in the verified GitHub main commit:
[code]
0fd784e0955de197133312b48b2c6795b…
[/code]
is intact and valid.
It has:
[list]
[]A correct binary PNG header beginning with [code]0x89PNG[/code]
[]A file size of exactly 1,906,561 bytes
[*]No evidence of UTF-8 text-encoding corruption
[/list]
[b]Conclusion[/b]
The local workspace copy was corrupted because binary image data was processed or transferred as UTF-8 text. The verified GitHub version remains valid and should be used to replace the corrupted local copy.