Open Source Adobe Lightroom likePierre-Loic Chevillot

Requirements Rich featured Graphical User Interface Adjustment Tools

Brightness and Contrast Saturation

Histogram Threads

Graphical User Interface

Adjustment Library Create as a Dynamic Link Library

Modularity Functions called on demand

Adjustment tools Brightness Contrast Saturation

Brightness and Contrastfloat v = 0;v = (float)(cValue + 100) / 100f;float m = 0.5f * (1.0f - v) + (float)bValue / 100f; cm = new ColorMatrix(new float[][]{ new float[]{v,0,0,0,0}, new float[]{0,v,0,0,0}, new float[]{0,0,v,0,0}, new float[]{0,0,0,1,0}, new float[]{m,m,m,0,1} });

Modification made by the class Color matrix

Avoid to open the image pixel per pixel to apply the modification

Contrast value are multiply to color component

Brightness value is add to the component

Saturationfloat red = (float) 0.3086;float green = (float) 0.6094;float blue = (float) 0.0820;

float sat = (float) (satValue + 100) / 100f ;float redSaturation = (1 - sat) * red + sat;float redSaturationComp = (1 - sat) * red;float greenSaturation = (1 - sat) * green + sat;float greenSaturationComp = (1 - sat) * green;float blueSaturation = (1 - sat) * blue + sat;float blueSaturationComp = (1 - sat) * blue;

Increase the intensity of color

Color component is weight

Weight of the component depends of the luminance

Values given by Adobe

Threads Parallel execution 3 threads

Main application Histogram calculation Paint Handler

Mutual exclusion Semaphore

Delegate function Function pointer Permit access to GUI from a thread

Conclusion