#include <qimage.h>
#include <qstring.h>
#include <qapplication.h>
#include "color.h"
#include "../../gui/statusWidget.h"
Include dependency graph for color.cpp:
Go to the source code of this file.
Functions | |
QImage * | improveColorBalance (QString filename, StatusWidget *status) |
|
Definition at line 89 of file color.cpp. References b, editedImage, StatusWidget::incrementProgress(), newProgress, StatusWidget::setStatus(), StatusWidget::showProgressBar(), status, and updateIncrement. Referenced by EditingInterface::colorBalance(). 00090 { 00091 //load original image 00092 QImage* editedImage = new QImage( filename ); 00093 00094 //convert to 32-bit depth if necessary 00095 if( editedImage->depth() < 32 ) 00096 { 00097 QImage* tmp = editedImage; 00098 editedImage = new QImage( tmp->convertDepth( 32, Qt::AutoColor ) ); 00099 delete tmp; tmp=NULL; 00100 } 00101 00102 //setup progress bar 00103 QString statusMessage = qApp->translate( "improveColorBalance", "Enhancing Color Balance:" ); 00104 status->showProgressBar( statusMessage, 100 ); 00105 qApp->processEvents(); 00106 00107 //update progress bar for every 1% of completion 00108 const int updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() ); 00109 int newProgress = 0; 00110 00111 //construct intensity histographs for each color channel 00112 int redVals[256]; 00113 int greenVals[256]; 00114 int blueVals[256]; 00115 int i=0; 00116 for(i=0; i<256; i++) 00117 { 00118 redVals[i] = 0; 00119 greenVals[i] = 0; 00120 blueVals[i] = 0; 00121 } 00122 00123 //populate histogram by iterating over all image pixels 00124 int numPixels = editedImage->width()*editedImage->height(); 00125 QRgb* rgb; 00126 uchar* scanLine; 00127 int x, y; 00128 for( y=0; y<editedImage->height(); y++) 00129 { 00130 //iterate over each selected pixel in scanline 00131 scanLine = editedImage->scanLine(y); 00132 for( x=0; x<editedImage->width(); x++) 00133 { 00134 rgb = ((QRgb*)scanLine+x); 00135 redVals[qRed(*rgb)]++; 00136 greenVals[qGreen(*rgb)]++; 00137 blueVals[qBlue(*rgb)]++; 00138 } //for x 00139 } //for y 00140 00141 //find 1% and 99% precenticles 00142 //we'll stretch these values so we avoid outliers from affecting the stretch 00143 int sumR=0; 00144 int sumG=0; 00145 int sumB=0; 00146 int indexLowR, indexHighR; 00147 int indexLowG, indexHighG; 00148 int indexLowB, indexHighB; 00149 indexLowR = -1; indexHighR = -1; 00150 indexLowG = -1; indexHighG = -1; 00151 indexLowB = -1; indexHighB = -1; 00152 for(i=0; i<256; i++) 00153 { 00154 sumR+=redVals[i]; 00155 sumG+=greenVals[i]; 00156 sumB+=blueVals[i]; 00157 00158 //if 1% not found yet and criteria met set index 00159 if(indexLowR < 0 && sumR >= 0.01*numPixels) 00160 { indexLowR = i; } 00161 if(indexLowG < 0 && sumG >= 0.01*numPixels) 00162 { indexLowG = i; } 00163 if(indexLowB < 0 && sumB >= 0.01*numPixels) 00164 { indexLowB = i; } 00165 00166 //if 99% not found yet and criteria met set index 00167 if(indexHighR < 0 && sumR >= 0.99*numPixels) 00168 { indexHighR = i; } 00169 if(indexHighG < 0 && sumG >= 0.99*numPixels) 00170 { indexHighG = i; } 00171 if(indexHighB < 0 && sumB >= 0.99*numPixels) 00172 { indexHighB = i; } 00173 } 00174 00175 //run through all image pixels a second time, this time scaling coordinates as necessary 00176 for( y=0; y<editedImage->height(); y++) 00177 { 00178 //iterate over each selected pixel in scanline 00179 scanLine = editedImage->scanLine(y); 00180 for( x=0; x<editedImage->width(); x++) 00181 { 00182 //get color coordinates and convert to 0-1 scale 00183 rgb = ((QRgb*)scanLine+x); 00184 double r = ((double)qRed(*rgb) ); 00185 double g = ((double)qGreen(*rgb) ); 00186 double b = ((double)qBlue(*rgb) ); 00187 00188 if(indexHighR != indexLowR) { r = (255*(r-indexLowR))/(indexHighR-indexLowR); } 00189 if(indexHighG != indexLowG) { g = (255*(g-indexLowG))/(indexHighG-indexLowG); } 00190 if(indexHighB != indexLowB) { b = (255*(b-indexLowB))/(indexHighB-indexLowB); } 00191 00192 int rp = (int) QMIN( QMAX(r, 0), 255 ); 00193 int gp = (int) QMIN( QMAX(g, 0), 255 ); 00194 int bp = (int) QMIN( QMAX(b, 0), 255 ); 00195 00196 //set adjusted color value 00197 *rgb = qRgb(rp,gp,bp); 00198 00199 //update status bar if significant progress has been made since last update 00200 newProgress++; 00201 if(newProgress >= updateIncrement) 00202 { 00203 newProgress = 0; 00204 status->incrementProgress(); 00205 qApp->processEvents(); 00206 } 00207 00208 } //for x 00209 } //for y 00210 00211 //remove status bar 00212 status->setStatus( "" ); 00213 qApp->processEvents(); 00214 00215 //return pointer to edited image 00216 return editedImage; 00217 }
|