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In this applet all pixels are treated equally.
For each one a new brightness is calculated from the old brightness.
Enter an expression, e.g.
h+30 and observe the result.
Look for expressions that have the following effects:
- The image is getting darker
- Contrast is smaller or stronger
- The image turns to its negativ
Position dependend calculations:
The variables x,y give the position of a pixel: top-left is (0,0), right bottom (320,320).
More suggestions
- Explain the effect of 20*floor(h/20).
- Explain the effect of h/2+x/5+y/5
Hints:
- Operators: +, -, *, /
- Functions: sqrt, exp, ln, sin, cos, tan
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absolute value: abs(...), sign: sgn(..), round: round(...), exponentiation pow(a,b)
- Results above 100 are treated as 100, negative values are treated as 0.
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