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2005.10.12 12:11 "how to update tiled YCbCr JPEG image?", by Eugene Shebeko
Hello.
I have a tiled YCbCr JPEG and try to update it
#include <stdio.h>
#include <tiff/libtiff/tiffio.h>
int main(int argc,char** argv)
{
char buf[98304];
memset(buf,0,sizeof(buf));
TIFF* tif=TIFFOpen("tjpeg2.tif","a");
TIFFSetDirectory(tif,0);
TIFFWriteEncodedTile(tif,3000,buf,sizeof(buf));
TIFFClose(tif);
return 0;
}
The source image I get from image samples
ftp://ftp.remotesensing.org/pub/geotiff/samples/misc
An expected result should be replacing a one tile.
But when I read modified image other tiles looks like wrong color converted.
What's I doing wrong?
There is no changes in output binary file except a requested tile and
in IDF.
Maybe it because JPEG Tables are changed too?
2 tags are added in result image is YCbCr Subsampling=2,2 and
Reference Black/White:
0: 0 255
1: 128 255
2: 128 255
Changing it value explicity have no effect to result image.
Other IDF in this image after modification still correct.
This is a tag dump of source and result image.
Source file:
TIFF Directory at offset 0x90fefae
Subfile Type: (0 = 0x0)
Image Width: 16716 Image Length: 16716
Tile Width: 256 Tile Length: 256
Resolution: 714.286, 714.286 pixels/cm
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
DateTime: 2000:07:12 10:02:00
Tag 34264: 0.006915,-0.172433,0.000000,744072.520242,0.172433,0.006915,...
Tag 34461: 152039232
Tag 34735: 1,1,0,6,1024,0,1,1,1025,0,1,1,2048,0,1,4269,2049,34737,6,0,...
Tag 34737: NAD83|UTM zone 16N|
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffac2e
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 8358 Image Length: 8358
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffd11c
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 4179 Image Length: 4179
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffdd0a
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 2090 Image Length: 2090
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffe278
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 1045 Image Length: 1045
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffe626
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 523 Image Length: 523
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffe954
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 262 Image Length: 262
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffec5a
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 131 Image Length: 131
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
Modified file:
TIFF Directory at offset 0x90fefae
Subfile Type: (0 = 0x0)
Image Width: 16716 Image Length: 16716
Tile Width: 256 Tile Length: 256
Resolution: 714.286, 714.286 pixels/cm
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 1, 1
Samples/Pixel: 3
Planar Configuration: single image plane
Reference Black/White:
0: 0 255
1: 128 255
2: 128 255
DateTime: 2000:07:12 10:02:00
Tag 34264: 0.006915,-0.172433,0.000000,744072.520242,0.172433,0.006915,...
Tag 34461: 152039232
Tag 34735: 1,1,0,6,1024,0,1,1,1025,0,1,1,2048,0,1,4269,2049,34737,6,0,...
Tag 34737: NAD83|UTM zone 16N|
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffac2e
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 8358 Image Length: 8358
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffd11c
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 4179 Image Length: 4179
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffdd0a
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 2090 Image Length: 2090
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffe278
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 1045 Image Length: 1045
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffe626
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 523 Image Length: 523
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffe954
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 262 Image Length: 262
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)
TIFF Directory at offset 0x8ffec5a
Subfile Type: reduced-resolution image (1 = 0x1)
Image Width: 131 Image Length: 131
Tile Width: 256 Tile Length: 256
Bits/Sample: 8
Compression Scheme: JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 2
Samples/Pixel: 3
Planar Configuration: single image plane
JPEG Tables: (574 bytes)