I pulled an image off the net and it looks a little too contrasty, what happened?
Viewing environments typical of computing are quite bright. When an image is coded according to video standards it implicitly carries the assumption of a dim surround. If it is displayed without correction in a bright ambient, it will appear contrasty. In this circumstance you should apply a power function with an exponent of about 1/1.1 or 1/1.2 to correct for your bright surround. Ambient lighting is rarely taken into account in the exchange of computer images. If an image is created in a dark environment and transmitted to a viewer in a bright environment, the recipient will find it to have excessive contrast. If an image originated in a bright environment and viewed in a bright environment, it will need no modification no matter what coding is applied. But then it will carry an assumption of a bright surround. Video standards are widespread and well optimized for vision, so it makes sense to code with a power function of 0.45 and retain a single standard for the assumed viewing env
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