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2009.09.14 17:30 "8-bit JPEG broken in 3.9.x?", by Dwight Kelly
Hello,
I am getting strange results with JPEG compression and libtiff 3.9.1.
Below is a test program. The output for 8-bit JPEG in gray and RGB
colorspaces are wrong. Instead of horizontal stripes I get a solid color.
---
Dwight Kelly
Apago, Inc.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tiffio.h"
unsigned char *
create_test_image(uint16 samples, uint16 bitdepth, uint32 wpix, uint32 hpix)
{
uint32 stride = ((samples * bitdepth * wpix)+7) / 8;
unsigned char *buf = (unsigned char*)malloc(stride * hpix);
unsigned char *bp = buf;
int state = 1;
uint32 h, qtrh = hpix/4;
for (h=0;h<hpix;h++) {
if (h % qtrh == 0)
state = !state;
memset(bp, (state)?0:0xff, stride);
bp += stride;
}
return buf;
}
int
main(int argc, char **argv)
{
static uint16 photometrics[] = {
PHOTOMETRIC_MINISWHITE, PHOTOMETRIC_MINISWHITE,
PHOTOMETRIC_MINISWHITE, PHOTOMETRIC_MINISWHITE, PHOTOMETRIC_MINISWHITE,
PHOTOMETRIC_MINISWHITE, PHOTOMETRIC_MINISWHITE,
PHOTOMETRIC_MINISWHITE, PHOTOMETRIC_MINISWHITE,
PHOTOMETRIC_RGB, PHOTOMETRIC_RGB, PHOTOMETRIC_RGB,
PHOTOMETRIC_RGB
};
static uint16 bitdepths[] = {
1, 1, 1, 1, 1,
8, 8, 8, 8,
8, 8, 8, 8
};
static uint16 compressions[] = {
COMPRESSION_ADOBE_DEFLATE, COMPRESSION_PACKBITS,
COMPRESSION_LZW, COMPRESSION_CCITTFAX3, COMPRESSION_CCITTFAX4,
COMPRESSION_ADOBE_DEFLATE, COMPRESSION_PACKBITS,
COMPRESSION_LZW, COMPRESSION_JPEG,
COMPRESSION_ADOBE_DEFLATE, COMPRESSION_PACKBITS,
COMPRESSION_LZW, COMPRESSION_JPEG
};
int i;
for (i=0; i < sizeof(photometrics)/sizeof(uint16); i++) {
char *cspace = "unknown";
if (photometrics[i] == PHOTOMETRIC_MINISWHITE ||
photometrics[i] == PHOTOMETRIC_MINISBLACK) {
if (bitdepths[i] == 1)
cspace = "mono";
else
cspace = "gray";
} else if (photometrics[i] == PHOTOMETRIC_RGB) {
cspace = "rgb";
} else if (photometrics[i] == PHOTOMETRIC_SEPARATED) {
cspace = "cmyk";
}
char fn[256];
sprintf(fn, "test_%s_%d_%d.tif", cspace, bitdepths[i],
compressions[i]);
TIFF *tif = TIFFOpen(fn, "w");
if (!tif) {
puts("ERROR: TIFFOpen failed\n");
return 1;
}
uint32 hpix = 512, wpix = 512;
uint16 samples = 1;
if (photometrics[i] == PHOTOMETRIC_RGB)
samples = 3;
else if (photometrics[i] == PHOTOMETRIC_SEPARATED)
samples = 4;
unsigned char *img = create_test_image(samples,
bitdepths[i], wpix, hpix);
TIFFSetField(tif, TIFFTAG_PLANARCONFIG,
PLANARCONFIG_CONTIG);
TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, photometrics[i]);
TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, samples);
TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bitdepths[i]);
TIFFSetField(tif, TIFFTAG_COMPRESSION, compressions[i]);
TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, wpix);
TIFFSetField(tif, TIFFTAG_IMAGELENGTH, hpix);
uint32 h;
unsigned char *ip = img;
for (h=0; h<hpix; h++) {
if (TIFFWriteScanline(tif, ip, h, 0) < 0) {
puts("ERROR: TIFFWriteScanline failed\n");
return 1;
}
ip += TIFFScanlineSize(tif);
}
free(img);
TIFFClose(tif);
}
return 0;
}