unity pc build what does compression method mean

The left image has been “gamma corrected”, which means it has a gamma value such that it will be displayed correctly after the screen’s gamma is applied to the image. A gamma of 2.2, the reciprocal of 0.45, when applied to the brightened images will darken them, leaving the original image.įor example, the above left image represents what is stored on your computer, and when that is displayed, the result looks like the center image. CRT screens, simply by how they work, apply a gamma of around 2.2, and modern LCD screens are designed to mimic that behavior. This is where the non-linear response of displays comes in. You may be wondering why images display correctly, and don’t look too bright. In fact, nearly every image you see on your computer has that gamma applied to it. This is the default behavior of nearly every digital camera, as well as image editing applications and so on. For example, a neutral grey in an image doesn’t have a numerical intensity of 0.5, rather it is around 0.73, while pure whites and blacks remain the same. Images stored like this are in “gamma space”. The darker regions of the image are now recorded using a greater range of values while bright ranges are compressed. Most images are stored with a gamma of 0.45 applied to them, which will have the effect demonstrated in the above left image. While the corresponding numerical values in linear space are correct, in the non-linear space (gamma = 0.45, more on this later) we can’t simply double the value to get the correct intensity. Below is an example where an intensity value is doubled in a linear and a non-linear color space. A color space without that property is called ”non-linear”. This means that the colors can be added and multiplied correctly. Simply, it means that numerical intensity values correspond proportionally to their perceived intensity. This document will define gamma and linear space, how they differ, and how it applies to the Unity engine.įirst we need to know what linear color space is. Though linear space and its counterpart, gamma space, are fairly simple and important concepts to understand, many developers don't learn what these terms really mean.

Linear space lighting is a term that game developers are becoming ever more used to hearing as games reach for the next level of realism with physically based rendering models (PBR).

Unity pc build what does compression method mean