![img = ReadImage["cat256x256.ppm"] ; RowBox[{RowBox[{scale, , =, , 1.5}], ;}]](../HTMLFiles/index_61.gif){kind=small}
Image histogram modifications (gray-scale images)
Example #1
Load gray-scale image
Display image
![ShowImage[img, scale] ;](../HTMLFiles/index_62.gif){kind=small}
![[Graphics:../HTMLFiles/index_63.gif]](../HTMLFiles/index_63.gif)
Plot image histogram
![ShowHistogram[img] ;](../HTMLFiles/index_64.gif){kind=small}
![[Graphics:../HTMLFiles/index_65.gif]](../HTMLFiles/index_65.gif)
Histogram equalization of image
![tmp = HistogramEqualization[img] ; ShowHistogram[tmp] ; ShowImage[tmp, scale] ;](../HTMLFiles/index_66.gif){kind=small}
![[Graphics:../HTMLFiles/index_67.gif]](../HTMLFiles/index_67.gif)
![[Graphics:../HTMLFiles/index_68.gif]](../HTMLFiles/index_68.gif)
Histogram squeeze image
![tst = HistogramStretch[img, 0, 50] ; ShowHistogram[tst] ; ShowImage[tst, scale] ;](../HTMLFiles/index_69.gif){kind=small}
![[Graphics:../HTMLFiles/index_70.gif]](../HTMLFiles/index_70.gif)
![[Graphics:../HTMLFiles/index_71.gif]](../HTMLFiles/index_71.gif)
Histogram stretch of histogram-squeezed image
![tmp = HistogramStretch[tst, 0, 255] ; ShowHistogram[tmp] ; ShowImage[tmp, scale] ;](../HTMLFiles/index_72.gif){kind=small}
![[Graphics:../HTMLFiles/index_73.gif]](../HTMLFiles/index_73.gif)
![[Graphics:../HTMLFiles/index_74.gif]](../HTMLFiles/index_74.gif)
Histogram equalization of histogram-squeezed image
![tmp = HistogramEqualization[tst] ; ShowHistogram[tmp] ; ShowImage[tmp, scale] ;](../HTMLFiles/index_75.gif){kind=small}
![[Graphics:../HTMLFiles/index_76.gif]](../HTMLFiles/index_76.gif)
![[Graphics:../HTMLFiles/index_77.gif]](../HTMLFiles/index_77.gif)
Example #2
Load gray-scale image
![img = ReadImage["bakery256x256.ppm"] ; RowBox[{RowBox[{scale, , =, , 1.5}], ;}]](../HTMLFiles/index_78.gif){kind=small}
Display image
![ShowImage[img, scale] ;](../HTMLFiles/index_79.gif){kind=small}
![[Graphics:../HTMLFiles/index_80.gif]](../HTMLFiles/index_80.gif)
Plot image histogram
![ShowHistogram[img] ;](../HTMLFiles/index_81.gif){kind=small}
![[Graphics:../HTMLFiles/index_82.gif]](../HTMLFiles/index_82.gif)
Histogram equalization of image
![tmp = HistogramEqualization[img] ; ShowHistogram[tmp] ; ShowImage[tmp, scale] ;](../HTMLFiles/index_83.gif){kind=small}
![[Graphics:../HTMLFiles/index_84.gif]](../HTMLFiles/index_84.gif)
![[Graphics:../HTMLFiles/index_85.gif]](../HTMLFiles/index_85.gif)
Histogram squeeze image
![tst = HistogramStretch[img, 0, 50] ; ShowHistogram[tst] ; ShowImage[tst, scale] ;](../HTMLFiles/index_86.gif){kind=small}
![[Graphics:../HTMLFiles/index_87.gif]](../HTMLFiles/index_87.gif)
![[Graphics:../HTMLFiles/index_88.gif]](../HTMLFiles/index_88.gif)
Histogram stretch of histogram-squeezed image
![tmp = HistogramStretch[tst, 0, 255] ; ShowHistogram[tmp] ; ShowImage[tmp, scale] ;](../HTMLFiles/index_89.gif){kind=small}
![[Graphics:../HTMLFiles/index_90.gif]](../HTMLFiles/index_90.gif)
![[Graphics:../HTMLFiles/index_91.gif]](../HTMLFiles/index_91.gif)
Histogram equalization of histogram-squeezed image
![tmp = HistogramEqualization[tst] ; ShowHistogram[tmp] ; ShowImage[tmp, scale] ;](../HTMLFiles/index_92.gif){kind=small}
![[Graphics:../HTMLFiles/index_93.gif]](../HTMLFiles/index_93.gif)
![[Graphics:../HTMLFiles/index_94.gif]](../HTMLFiles/index_94.gif)
Created by Mathematica (February 5, 2004)