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.
