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97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/* PILusm, a gaussian blur and unsharp masking library for PIL
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By Kevin Cazabon, copyright 2003
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kevin_cazabon@hotmail.com
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kevin@cazabon.com */
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/* Originally released under LGPL. Graciously donated to PIL
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for distribution under the standard PIL license in 2009." */
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#include "Python.h"
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#include "Imaging.h"
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typedef UINT8 pixel[4];
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static inline UINT8 clip8(int in)
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{
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if (in >= 255)
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return 255;
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if (in <= 0)
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return 0;
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return (UINT8) in;
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}
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Imaging
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ImagingUnsharpMask(Imaging imOut, Imaging imIn, float radius, int percent,
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int threshold)
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{
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ImagingSectionCookie cookie;
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Imaging result;
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int x, y, diff;
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pixel *lineIn = NULL;
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pixel *lineOut = NULL;
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UINT8 *lineIn8 = NULL;
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UINT8 *lineOut8 = NULL;
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/* First, do a gaussian blur on the image, putting results in imOut
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temporarily. All format checks are in gaussian blur. */
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result = ImagingGaussianBlur(imOut, imIn, radius, 3);
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if (!result)
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return NULL;
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/* Now, go through each pixel, compare "normal" pixel to blurred
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pixel. If the difference is more than threshold values, apply
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the OPPOSITE correction to the amount of blur, multiplied by
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percent. */
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ImagingSectionEnter(&cookie);
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for (y = 0; y < imIn->ysize; y++) {
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if (imIn->image8)
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{
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lineIn8 = imIn->image8[y];
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lineOut8 = imOut->image8[y];
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for (x = 0; x < imIn->xsize; x++) {
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/* compare in/out pixels, apply sharpening */
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diff = lineIn8[x] - lineOut8[x];
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if (abs(diff) > threshold) {
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/* add the diff*percent to the original pixel */
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lineOut8[x] = clip8(lineIn8[x] + diff * percent / 100);
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} else {
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/* new pixel is the same as imIn */
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lineOut8[x] = lineIn8[x];
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}
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}
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} else {
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lineIn = (pixel *)imIn->image32[y];
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lineOut = (pixel *)imOut->image32[y];
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for (x = 0; x < imIn->xsize; x++) {
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/* compare in/out pixels, apply sharpening */
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diff = lineIn[x][0] - lineOut[x][0];
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lineOut[x][0] = abs(diff) > threshold ?
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clip8(lineIn[x][0] + diff * percent / 100) : lineIn[x][0];
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diff = lineIn[x][1] - lineOut[x][1];
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lineOut[x][1] = abs(diff) > threshold ?
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clip8(lineIn[x][1] + diff * percent / 100) : lineIn[x][1];
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diff = lineIn[x][2] - lineOut[x][2];
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lineOut[x][2] = abs(diff) > threshold ?
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clip8(lineIn[x][2] + diff * percent / 100) : lineIn[x][2];
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diff = lineIn[x][3] - lineOut[x][3];
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lineOut[x][3] = abs(diff) > threshold ?
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clip8(lineIn[x][3] + diff * percent / 100) : lineIn[x][3];
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}
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}
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}
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ImagingSectionLeave(&cookie);
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return imOut;
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}
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