Avisynth virtualdub skin#

In RGB, changing chroma values also changes luma values. Let's say you want to reduce or increase the amount of green or some other color. But if you haven't changed anything else, they do nothing. What does the keep brightness and bad source options do? I ticked and unticked keep brightness but it made no change to the picture. The latter is basically an overall bright-and-dark 'Contrast' setting. This control is similar to Tweak's hue and saturation settings, while 'V' is really the same thing as 'intensity' used by Donald Graft.

'Real HSV': Frankly, I don't know what the designer meant by 'similar' or 'real', but since you can't change between them it doesn't seem to matter. An RGB gradation curve can let you do things such as making a 'notch' filter: for example, you can change only the RGB values of a color between RGB 10 and RGB 30 without changing anything else.

You can also adjust a specific range of colors, which is really limited in YUV. In RGB you can correct any color without affecting the others. On the other hand, if you adjust one chroma channel in YUV you affect the other, and there's no direct way to control the perception of Green without adjusting U and/or V. One advantage to working in YUV is that you can adjust luma with little effect chroma balance, or adjust chroma with little effect on luma. Also remember that adjusting any RGB color also adjusts luma chroma and luma values are stored together for each pixel in RGB. RGB 128 is the ultimate midpoint, or a neutral middle-gray if all 3 colors are involved. Anything brighter than 180 is considered the bright range.

Avisynth virtualdub skin#

Midtones include most of the skin tone range and extend from RGB 64 up to about 180. Most users would consider anything 'dark' to have RGB values from 0 to 64 or so. To vastly simply: you know that colors have an RGB range of 0 to 255. Unfortunately if you don't know the difference between the common terms dark, midpoint, and bright, you're at a disadvantage with any kind of image control whether you're in RGB or not. If you don't adjust the midpoint to begin with (set at '0'), Booster and Base Shift do nothing. 'Booster' will increase/decrease the amount of stretch above the midpoint 'Base Shift' will increase/decrease the amount of stretch below the midpoint. Adjusting it makes the midtones brighter or darker (more or less intense) but leaves the brightest and darkest colors as-is. In RGB, you adjust the middle point with this slider. With ColorYUV you can increase or decrease the amount of stretching of values, but you can't move the middle point. Raising or lowering the midpoint moves the midpoint from 128 to a higher or lower position on the scale.

without too much effect on the very darkest or very brightest values. In RGB or with ColorYUV, you can expand luma or colors toward the bright end by 'stretching' the image values from the middle upwards and downwards.

If you don't know what gamma is, then imagine that all your colors and luma from 0 to 255 have an RGB value of 128 at the middle of the scale. Similar or Real HSV - sHue or Real, sSat or Real, sValue or Real The MiddlePoint is an additional gamma setting. Middle Point - Settings, Middle Point, Booster, Base Shift