COLOR CORRECTION and more…

>Adobe Plugins:

●Auto color: it neutralizes the midtones while limiting the range of the black&white values.

●Fast color corrector: let us input the values of the black hey and white colors.

>Colorspaces (or Gamut: color ranges)

Adobe RGB 1998 (gamut 30% larger than sRGB - more colors but not all screens can display all those Adobe98 colors - PS: sRGB images will look dull on a Adobe RGB profile – Adobe RGB 98 is used to print photographs, books,...etc)

sRGB by Microsoft and HP (standard for all screens)

ProPhoto RGB wide gamut needs a wide gamut display

RGBA red green blue alpha

LAB the ensemble of colors that the average eye sees

CMYK is the standard for print

DCI-P3 (created by 7 of the largest studios: 20th century, Warner bros, Sony, Waltz Disney, Paramount, Universal, Metro-Goldwyn-Mayer - needs a wide gamut display like the Adobe RGB98)

Rec.2020 standard for Ultra High Definition Tv (UHDTV) (4k & 8k)

HSL = HSV hue saturation lightness/value

HSB hue saturation brightness & HSI hue saturation intensity

YUV=YCbCr (Y is luma and UV are the color (chroma) while Cb is blue minus luma Cr is red minus luma) more realistic color than sRGB (PAL and SECAM systems

>The 8bit Limits:

RGB values for each color range from 0 to255

In RGBA the A is 0 (transparent) or 1 (opaque)

YUV values: Y ranges from 0 to 1, u and v are -0.5 to 0.5

We can convert RGB to YUV with math equations:

R=Y+1.4(U-128)

G=Y-0.3 (V-128)-0.7 (U-128)

B=Y+(V-128)

>Definition:

Hue: the color character

Brightness: the attribute of a visual sensation according to which area emits more or less light.

Lightness (value): the brightness relative to the brightness of a similarly illuminated white.

Saturation: the amount of white and black in a color, or how much the color is pure.

Temperature: symmetrical balance between red and blue (R up, B down)

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Tint: symmetrical balance between RB and G (RB up, G down)

LUT: lookup tables: a new process in presenting colors via different gamuts (used to color correct shots or use them creatively).

>Blending Layers:

Multiply: would color what is white (Makes White transparent)

Screen: would color what is black. (Makes Black transparent)

Overlay: would color what is white and both layers luminance (amazing for greyscale on top of colors)

Broadcast Definition:

>Old Color encoding Systems for broadcast

PAL: phase alternating line for analogue tv (576i, 25 fps)

NTSC: national television system committee

SECAM: séquentiel couleur à mémoire

>New color encoding systems for broadcast

DVB: digital video broadcasting

ISDB: integrated services digital broadcasting

DTMB: digital terrestrial multimedia broadcast

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