InspectPNG

Often PNG files contains hidden messages

Get it from the Mac App Store

Examine the low-level internals of PNG image files.

Chunks supported:
- IHDR - Image's width, height and bit depth.
- PLTE - Palette.
- gAMA - Gamma.
- tEXt - Textual data.
- pHYs - Physical pixel dimensions.
- cHRM - Primary chromaticities.
- sRGB - Standard RGB color space.
- sBIT - Significants Bits.
- CgBI - Apple's proprietary extension to PNG.
- bKGD - Default background color to present the image against.
- tIME - Last-modification time.

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