Grid Pictures Modification. Geometrical Modifications Clip – Rectangular – Other shapes Rotate – Left, Right – 180 degrees – Flip.

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Presentation transcript:

Grid Pictures Modification

Geometrical Modifications Clip – Rectangular – Other shapes Rotate – Left, Right – 180 degrees – Flip

warping

Morphing

Resolution modification Resolution / number of pixels /dimensions of picture Resolution Decreasing (average color of pixels) Resolution increasing - copying of pixels - dithering

Color depth decreasing Rounding of colors Establishing of color palette Half toning Dithering

Half Toning Half tone matrix – example

Floyd Steinberg dithering 7/16 3/165/16 1/16

Pixel color correction Color correction Saturation correction Brightness correction – Simple brightness correction – Contrast correction – Gamma correction

Saturation S

Saturation correction S

Brightness Light

Brightness histogramm K W

Color brightness Y = 0,299R + 0,587G B

Simple brightness correction Original br New br

Simple brightness decreasing Original br New br

Contrast decreasing Original br New br

Contrast increasing Original br New br

Gamma correction of brightness Original br New br

Gamma function Tedy Y = 255 * (x/255) 1/γ Y = x 1/γ Y = y min + (y max -y min )*(x/x max ) 1/γ

Gamma correction Original bright nessOn γ=0,5γ=2, , , , , , , , , , , , , ,117650, , , , ,250980, , , , ,86270, ,