Magenta Chroma Key

Start with example $1\mathrm{.}1\mathrm{.}2.$

Modify the program my reading in angryFigurineMagenta. mat, rather than angryFigurine.mat.

Adjust the program's logic to replace magenta pixels with pixels are red. Create a new varaible magentaExtract that contains a mask showing where pixels are magenta $)=(1$ or another color $)=(0.$ Correct ouput will produce:

$\backslash$table$[[$Figure $1],[$File Edit View Insert Tools Desktop Window Help$]]$

Hint: Magenta pixels will have red and blue pixels with values $>0\mathrm{.}8255$

Hint: Remember the Helpl channel in MS Teams

Script $0$

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MATLAB Documentation

$3\%$ TODO Remeber the class help channel!

$98$ TODO Probably need a change here!

load angryfigurine $\%$ Assumes image is stored in$.$ mat file and accessible from command window

$8.$ Extract RGB layers from color image:

redLayer $=$ angryFigurine $($:$,$:$,1)$ :

greenLayer $=$ angryFigurine $($:$,$:$,2)$;

blueLayer $=$ angryFigurine $($:$,$:$,3)$;

$\%$ Set threshold to detect the mostly green pixels:

greenExtract greenLayer $>0\mathrm{.}8**255$ the $0\mathrm{.}8$ threshold value decides which pixels are "green"

S$4$ TODO need to add logic here that detects magenta pixels

$84$ TODO probably need a change herel

$\%$ TODO magentaExtract $=$dots

Identify pixel positions that are mostly green:

extractLogicaLArray $=$ greenExtract;

$88$ TODO set the pixels of interest to red, rather than white

$\%$ TODO remember to update the comments!

is Set the color of the pixel mostly green pixels to white $)=(255,255,255$ :

redLayer$($extractLogicaLArray$)=255$;$,$ & maximize red component of the identified pixels

greenLayer$($extractLogicalArray$)=255$; maximize green component of the identified pixels

blueLayer$($extractLogicalArray$)=255$; s maximize blue component of the identified pixels

$\%$ Create modified color image:

FigureMod $($:$,$:$,1)=$ redLayer:

FigureMod $($:$,2,2)=$ greenLayer;