| Summary: | FILEIO : add new option to use quality of the original JPEG picture | ||
|---|---|---|---|
| Product: | [Applications] digikam | Reporter: | S. Burmeister <sven.burmeister> |
| Component: | Plugin-DImg-JPEG | Assignee: | Digikam Developers <digikam-bugs-null> |
| Status: | REPORTED --- | ||
| Severity: | wishlist | CC: | ahuggel, caulier.gilles, cfeck |
| Priority: | NOR | ||
| Version: | 2.9.0 | ||
| Target Milestone: | --- | ||
| Platform: | openSUSE | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
|
Description
S. Burmeister
2009-12-09 13:52:21 UTC
Andreas, Do you have an idea, how gimp can take the image quality value (JPEG compression) from file ? It's recorded somewhere in metadata ? Gilles Caulier ImageMagick's "identify" tool can display Quality (and lots of other parameters the image was saved with) See http://www.imagemagick.org/script/identify.php GraphicsMagick might be an option, too, but haven't checked. imagemagick is already a dependency of digikam. So it could be used indeed. Thanks for the hint! no, IM is not a depency of digiKam, but to kipi-plugins, as run-time... Gilles Caulier Well, you could have a look at ImageMagick's source to see how to compute the average Quality from the quantization coefficient matrix. An IM example :
[gilles@localhost Camera]$ identify -verbose Bryce_2007_0102.jpg
Image: Bryce_2007_0102.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 3872x2592+0+0
Resolution: 300x300
Print size: 12.9067x8.64
Units: PixelsPerInch
Type: TrueColor
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Red:
min: 4 (0.0156863)
max: 255 (1)
mean: 112.346 (0.440574)
standard deviation: 49.9501 (0.195883)
kurtosis: -0.905399
skewness: 0.0162092
Green:
min: 3 (0.0117647)
max: 239 (0.937255)
mean: 94.4013 (0.370201)
standard deviation: 56.1 (0.22)
kurtosis: -0.899077
skewness: 0.540585
Blue:
min: 0 (0)
max: 232 (0.909804)
mean: 92.1944 (0.361547)
standard deviation: 71.8705 (0.281845)
kurtosis: -1.19741
skewness: 0.634281
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 99.6473 (0.390774)
standard deviation: 60.0211 (0.235377)
kurtosis: -1.00412
skewness: 0.407677
Rendering intent: Perceptual
Gamma: 0.45455
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Interlace: None
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Compose: Over
Page geometry: 3872x2592+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 99
Orientation: TopLeft
Properties:
comment: Bryce Canyon NP. Thor's hammer (si j'avais un marteau ...) Mais que pouvait bien venir faire Thor dans cet endroit ??
date:create: 2012-07-11T09:05:33+02:00
date:modify: 2008-03-06T00:00:00+01:00
exif:CFAPattern: 0, 2, 0, 2, 1, 0, 2, 1
exif:ColorSpace: 1
exif:ComponentsConfiguration: 1, 2, 3, 0
exif:CompressedBitsPerPixel: 4/1
exif:Compression: 6
exif:Contrast: 0
exif:CustomRendered: 0
exif:DateTime: 2007:07:30 08:44:54
exif:DateTimeDigitized: 2007:07:30 08:44:54
exif:DateTimeOriginal: 2007:07:30 08:44:54
exif:DigitalZoomRatio: 1/1
exif:ExifImageLength: 2592
exif:ExifImageWidth: 3872
exif:ExifOffset: 277
exif:ExifVersion: 48, 50, 50, 49
exif:ExposureBiasValue: 0/6
exif:ExposureMode: 0
exif:ExposureProgram: 3
exif:ExposureTime: 10/800
exif:FileSource: 3
exif:Flash: 0
exif:FlashPixVersion: 48, 49, 48, 48
exif:FNumber: 100/10
exif:FocalLength: 180/10
exif:FocalLengthIn35mmFilm: 27
exif:GainControl: 0
exif:GPSInfo: 3378
exif:GPSVersionID: 2, 2, 0, 0
exif:InteroperabilityIndex: R98
exif:InteroperabilityOffset: 3348
exif:InteroperabilityVersion: 48, 49, 48, 48
exif:ISOSpeedRatings: 100
exif:JPEGInterchangeFormat: 3502
exif:JPEGInterchangeFormatLength: 9141
exif:LightSource: 9
exif:Make: NIKON CORPORATION
exif:MakerNote: 78, 105, 107, 111, 110, 0, 2, 16, 0, 0, 77, 77, 0, 42, 0, 0, 0, 8, 0, 51, 0, 1, 0, 7, 0, 0, 0, 4, 48, 50, 49, 48, 0, 2, 0, 3, 0, 0, 0, 2, 0, 0, 0, 100, 0, 3, 0, 2, 0, 0, 0, 6, 0, 0, 2, 114, 0, 4, 0, 2, 0, 0, 0, 8, 0, 0, 2, 120, 0, 5, 0, 2, 0, 0, 0, 13, 0, 0, 2, 128, 0, 6, 0, 2, 0, 0, 0, 7, 0, 0, 2, 141, 0, 7, 0, 2, 0, 0, 0, 7, 0, 0, 2, 148, 0, 8, 0, 2, 0, 0, 0, 13, 0, 0, 2, 155, 0, 9, 0, 2, 0, 0, 0, 20, 0, 0, 2, 168, 0, 11, 0, 8, 0, 0, 0, 1, 0, 0, 0, 0, 0, 12, 0, 5, 0, 0, 0, 4, 0, 0, 2, 188, 0, 13, 0, 7, 0, 0, 0, 4, 0, 1, 6, 0, 0, 14, 0, 7, 0, 0, 0, 4, 0, 1, 12, 0, 0, 17, 0, 4, 0, 0, 0, 1, 0, 0, 9, 62, 0, 18, 0, 7, 0, 0, 0, 4, 0, 1, 6, 0, 0, 19, 0, 3, 0, 0, 0, 2, 0, 0, 0, 100, 0, 22, 0, 3, 0, 0, 0, 4, 0, 0, 2, 220, 0, 23, 0, 7, 0, 0, 0, 4, 0, 1, 6, 0, 0, 24, 0, 7, 0, 0, 0, 4, 0, 1, 6, 0, 0, 25, 0, 10, 0, 0, 0, 1, 0, 0, 2, 228, 0, 27, 0, 3, 0, 0, 0, 7, 0, 0, 2, 236, 0, 28, 0, 7, 0, 0, 0, 3, 0, 1, 6, 0, 0, 29, 0, 2, 0, 0, 0, 8, 0, 0, 2, 250, 0, 30, 0, 3, 0, 0, 0, 1, 0, 1, 0, 0, 0, 32, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 129, 0, 2, 0, 0, 0, 9, 0, 0, 3, 2, 0, 131, 0, 1, 0, 0, 0, 1, 6, 0, 0, 0, 0, 132, 0, 5, 0, 0, 0, 4, 0, 0, 3, 11, 0, 135, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 136, 0, 7, 0, 0, 0, 4, 0, 9, 2, 0, 0, 137, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 138, 0, 3, 0, 0, 0, 1, 0, 2, 0, 0, 0, 139, 0, 7, 0, 0, 0, 4, 64, 1, 12, 0, 0, 141, 0, 2, 0, 0, 0, 9, 0, 0, 3, 43, 0, 144, 0, 2, 0, 0, 0, 12, 0, 0, 3, 52, 0, 145, 0, 7, 0, 0, 3, 16, 0, 0, 3, 64, 0, 146, 0, 8, 0, 0, 0, 1, 0, 0, 0, 0, 0, 149, 0, 2, 0, 0, 0, 5, 0, 0, 6, 80, 0, 151, 0, 7, 0, 0, 2, 96, 0, 0, 6, 85, 0, 152, 0, 7, 0, 0, 0, 31, 0, 0, 8, 181, 0, 154, 0, 5, 0, 0, 0, 2, 0, 0, 8, 212, 0, 162, 0, 4, 0, 0, 0, 1, 0, 85, 42, 200, 0, 163, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 165, 0, 4, 0, 0, 0, 1, 0, 0, 9, 115, 0, 166, 0, 4, 0, 0, 0, 1, 0, 0, 0, 0, 0, 167, 0, 4, 0, 0, 0, 1, 0, 0, 9, 115, 0, 168, 0, 7, 0, 0, 0, 20, 0, 0, 8, 228, 0, 169, 0, 2, 0, 0, 0, 16, 0, 0, 8, 248, 0, 170, 0, 2, 0, 0, 0, 16, 0, 0, 9, 8, 0, 176, 0, 7, 0, 0, 0, 16, 0, 0, 9, 24, 0, 177, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 67, 79, 76, 79, 82, 0, 70, 73, 78, 69, 32, 32, 32, 0, 83, 85, 78, 78, 89, 32, 32, 32, 32, 32, 32, 32, 0, 78, 79, 82, 77, 65, 76, 0, 65, 70, 45, 83, 32, 32, 0, 78, 79, 82, 77, 65, 76, 32, 32, 32, 32, 32, 32, 0, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 0, 0, 0, 1, 206, 0, 0, 1, 0, 0, 0, 1, 102, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 15, 32, 10, 32, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 15, 64, 10, 56, 15, 64, 10, 56, 0, 0, 0, 0, 32, 32, 32, 32, 32, 32, 32, 0, 65, 85, 84, 79, 32, 32, 32, 32, 0, 0, 0, 0, 180, 0, 0, 0, 10, 0, 0, 2, 188, 0, 0, 0, 10, 0, 0, 0, 35, 0, 0, 0, 10, 0, 0, 0, 45, 0, 0, 0, 10, 77, 79, 68, 69, 51, 32, 32, 32, 0, 78, 65, 84, 85, 82, 65, 76, 32, 32, 32, 32, 0, 48, 50, 48, 55, 44, 200, 40, 99, 140, 36, 162, 43, 21, 117, 252, 27, 87, 176, 38, 185, 105, 54, 32, 39, 75, 140, 234, 101, 253, 178, 132, 115, 127, 168, 238, 81, 209, 110, 40, 255, 243, 4, 50, 125, 229, 106, 12, 203, 167, 160, 182, 233, 57, 166, 48, 215, 155, 124, 122, 149, 205, 34, 148, 35, 207, 152, 126, 129, 161, 222, 56, 175, 67, 244, 194, 173, 55, 252, 52, 71, 247, 144, 1, 27, 9, 86, 14, 101, 240, 108, 54, 227, 181, 146, 164, 218, 108, 136, 14, 177, 113, 9, 74, 95, 181, 228, 82, 221, 133, 74, 44, 43, 71, 248, 251, 73, 137, 134, 80, 55, 48, 172, 74, 200, 107, 250, 52, 69, 110, 253, 158, 224, 6, 24, 79, 15, 227, 114, 150, 13, 85, 186, 60, 218, 208, 112, 102, 121, 169, 231, 113, 246, 186, 236, 23, 133, 0, 114, 249, 27, 130, 104, 47, 139, 17, 47, 242, 191, 51, 48, 114, 60, 57, 236, 156, 77, 55, 128, 38, 84, 72, 195, 132, 50, 47, 153, 124, 240, 157, 249, 212, 202, 15, 24, 190, 65, 225, 158, 120, 111, 129, 180, 7, 115, 235, 155, 24, 7, 116, 80, 134, 217, 73, 194, 240, 83, 7, 44, 74, 132, 165, 127, 155, 211, 114, 20, 98, 69, 53, 34, 126, 93, 243, 254, 150, 157, 197, 31, 105, 235, 135, 65, 20, 9, 25, 9, 16, 247, 123, 28, 250, 148, 201, 130, 244, 122, 63, 56, 215, 168, 136, 94, 152, 199, 35, 148, 34, 205, 149, 122, 126, 155, 215, 48, 166, 57, 233, 166, 160, 167, 203, 14,
exif:MaxApertureValue: 36/10
exif:MeteringMode: 2
exif:Model: NIKON D200
exif:Orientation: 1
exif:ResolutionUnit: 2
exif:Saturation: 0
exif:SceneCaptureType: 0
exif:SceneType: 1
exif:SensingMethod: 2
exif:Sharpness: 0
exif:Software: Ver.2.00
exif:SubjectDistanceRange: 0
exif:SubSecTime: 73
exif:SubSecTimeDigitized: 73
exif:SubSecTimeOriginal: 73
exif:UserComment: 65, 83, 67, 73, 73, 0, 0, 0, 66, 114, 121, 99, 101, 32, 67, 97, 110, 121, 111, 110, 32, 78, 80, 46, 32, 32, 84, 104, 111, 114, 39, 115, 32, 104, 97, 109, 109, 101, 114, 32, 40, 115, 105, 32, 106, 39, 97, 118, 97, 105, 115, 32, 117, 110, 32, 109, 97, 114, 116, 101, 97, 117, 32, 46, 46, 46, 41, 32, 77, 97, 105, 115, 32, 113, 117, 101, 32, 112, 111, 117, 118, 97, 105, 116, 32, 98, 105, 101, 110, 32, 118, 101, 110, 105, 114, 32, 102, 97, 105, 114, 101, 32, 84, 104, 111, 114, 32, 100, 97, 110, 115, 32, 99, 101, 116, 32, 101, 110, 100, 114, 111, 105, 116, 32, 63, 63, 32
exif:WhiteBalance: 1
exif:XResolution: 300/1
exif:YCbCrPositioning: 2
exif:YResolution: 300/1
jpeg:colorspace: 2
jpeg:sampling-factor: 2x1,1x1,1x1
signature: 70f55c68fa1f5a1e244988f290246cb5b6ee2939208fb6695c2c8994a945889d
unknown: digiKam-0.9.2-final
Profiles:
Profile-8bim: 290 bytes
Profile-exif: 12649 bytes
Profile-iptc: 277 bytes
Originating Program[2,65]: digiKam
Program Version[2,70]: 0.9.2-final
Caption[2,120]: Bryce Canyon NP. Thor's hammer (si j'avais un marteau ...) Mais que pouvait bien venir faire Thor dans cet endroit ??
Priority[2,10]: 5
Byline[2,80]: Pottier Michel
Byline Title[2,85]:
Credit[2,110]:
Src[2,115]:
Copyright String[2,116]: Pottier
Created Date[2,55]: 20070730
Created Time[2,60]: 084454+0000
Keyword[2,25]: Nature/Paysage
Keyword[2,25]: lieux/USA/Bryce NP
Artifacts:
filename: Bryce_2007_0102.jpg
verbose: true
Tainted: False
Filesize: 5.595MB
Number pixels: 10.04M
Pixels per second: 10.68MB
User time: 0.670u
Elapsed time: 0:01.940
Version: ImageMagick 6.7.5-10 2012-08-22 Q16 http://www.imagemagick.org
Look relevant info :
Compression: JPEG
Quality: 99
Gilles Caulier
Code taken from IM JPEG codec :
{
ssize_t
j,
qvalue,
sum;
register ssize_t
i;
/*
Determine the JPEG compression quality from the quantization tables.
*/
sum=0;
for (i=0; i < NUM_QUANT_TBLS; i++)
{
if (jpeg_info->quant_tbl_ptrs[i] != NULL)
for (j=0; j < DCTSIZE2; j++)
sum+=jpeg_info->quant_tbl_ptrs[i]->quantval[j];
}
if ((jpeg_info->quant_tbl_ptrs[0] != NULL) &&
(jpeg_info->quant_tbl_ptrs[1] != NULL))
{
ssize_t
hash[101] =
{
1020, 1015, 932, 848, 780, 735, 702, 679, 660, 645,
632, 623, 613, 607, 600, 594, 589, 585, 581, 571,
555, 542, 529, 514, 494, 474, 457, 439, 424, 410,
397, 386, 373, 364, 351, 341, 334, 324, 317, 309,
299, 294, 287, 279, 274, 267, 262, 257, 251, 247,
243, 237, 232, 227, 222, 217, 213, 207, 202, 198,
192, 188, 183, 177, 173, 168, 163, 157, 153, 148,
143, 139, 132, 128, 125, 119, 115, 108, 104, 99,
94, 90, 84, 79, 74, 70, 64, 59, 55, 49,
45, 40, 34, 30, 25, 20, 15, 11, 6, 4,
0
},
sums[101] =
{
32640, 32635, 32266, 31495, 30665, 29804, 29146, 28599, 28104,
27670, 27225, 26725, 26210, 25716, 25240, 24789, 24373, 23946,
23572, 22846, 21801, 20842, 19949, 19121, 18386, 17651, 16998,
16349, 15800, 15247, 14783, 14321, 13859, 13535, 13081, 12702,
12423, 12056, 11779, 11513, 11135, 10955, 10676, 10392, 10208,
9928, 9747, 9564, 9369, 9193, 9017, 8822, 8639, 8458,
8270, 8084, 7896, 7710, 7527, 7347, 7156, 6977, 6788,
6607, 6422, 6236, 6054, 5867, 5684, 5495, 5305, 5128,
4945, 4751, 4638, 4442, 4248, 4065, 3888, 3698, 3509,
3326, 3139, 2957, 2775, 2586, 2405, 2216, 2037, 1846,
1666, 1483, 1297, 1109, 927, 735, 554, 375, 201,
128, 0
};
qvalue=(ssize_t) (jpeg_info->quant_tbl_ptrs[0]->quantval[2]+
jpeg_info->quant_tbl_ptrs[0]->quantval[53]+
jpeg_info->quant_tbl_ptrs[1]->quantval[0]+
jpeg_info->quant_tbl_ptrs[1]->quantval[DCTSIZE2-1]);
for (i=0; i < 100; i++)
{
if ((qvalue < hash[i]) && (sum < sums[i]))
continue;
if (((qvalue <= hash[i]) && (sum <= sums[i])) || (i >= 50))
image->quality=(size_t) i+1;
if (image->debug != MagickFalse)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"Quality: %.20g (%s)",(double) i+1,(qvalue <= hash[i]) &&
(sum <= sums[i]) ? "exact" : "approximate");
break;
}
}
else
if (jpeg_info->quant_tbl_ptrs[0] != NULL)
{
ssize_t
hash[101] =
{
510, 505, 422, 380, 355, 338, 326, 318, 311, 305,
300, 297, 293, 291, 288, 286, 284, 283, 281, 280,
279, 278, 277, 273, 262, 251, 243, 233, 225, 218,
211, 205, 198, 193, 186, 181, 177, 172, 168, 164,
158, 156, 152, 148, 145, 142, 139, 136, 133, 131,
129, 126, 123, 120, 118, 115, 113, 110, 107, 105,
102, 100, 97, 94, 92, 89, 87, 83, 81, 79,
76, 74, 70, 68, 66, 63, 61, 57, 55, 52,
50, 48, 44, 42, 39, 37, 34, 31, 29, 26,
24, 21, 18, 16, 13, 11, 8, 6, 3, 2,
0
},
sums[101] =
{
16320, 16315, 15946, 15277, 14655, 14073, 13623, 13230, 12859,
12560, 12240, 11861, 11456, 11081, 10714, 10360, 10027, 9679,
9368, 9056, 8680, 8331, 7995, 7668, 7376, 7084, 6823,
6562, 6345, 6125, 5939, 5756, 5571, 5421, 5240, 5086,
4976, 4829, 4719, 4616, 4463, 4393, 4280, 4166, 4092,
3980, 3909, 3835, 3755, 3688, 3621, 3541, 3467, 3396,
3323, 3247, 3170, 3096, 3021, 2952, 2874, 2804, 2727,
2657, 2583, 2509, 2437, 2362, 2290, 2211, 2136, 2068,
1996, 1915, 1858, 1773, 1692, 1620, 1552, 1477, 1398,
1326, 1251, 1179, 1109, 1031, 961, 884, 814, 736,
667, 592, 518, 441, 369, 292, 221, 151, 86,
64, 0
};
qvalue=(ssize_t) (jpeg_info->quant_tbl_ptrs[0]->quantval[2]+
jpeg_info->quant_tbl_ptrs[0]->quantval[53]);
for (i=0; i < 100; i++)
{
if ((qvalue < hash[i]) && (sum < sums[i]))
continue;
if (((qvalue <= hash[i]) && (sum <= sums[i])) || (i >= 50))
image->quality=(size_t) i+1;
if (image->debug != MagickFalse)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"Quality: %.20g (%s)",(double) i+1,(qvalue <= hash[i]) &&
(sum <= sums[i]) ? "exact" : "approximate");
break;
}
}
}
See JPEGSetImageQuality() method from here for details :
https://www.imagemagick.org/subversion/ImageMagick/trunk/coders/jpeg.c
Maik, Another entry not too difficult to implement as IM code is here. A new method must be created in JPEGUtils to determine the JPEG compression quality from the quantization tables. A new option in JPEG IO File Settings must be add to use it as well. Gilles Git commit e908aa4e278967ad7276086eeb9ee61a8400f29b by Maik Qualmann. Committed on 30/06/2015 at 20:11. Pushed by mqualmann into branch 'master'. function added to get the JPEG quality from image, first used for lossy transform M +168 -0 libs/jpegutils/jpegutils.cpp M +1 -0 libs/jpegutils/jpegutils.h http://commits.kde.org/digikam/e908aa4e278967ad7276086eeb9ee61a8400f29b Git commit 60b3d50b19920499cc34814e37da4fa229252589 by Gilles Caulier. Committed on 01/07/2015 at 07:58. Pushed by cgilles into branch 'frameworks'. backport commit #e908aa4e278967ad7276086eeb9ee61a8400f29b from git/master to frameworks branch M +168 -0 libs/jpegutils/jpegutils.cpp M +1 -0 libs/jpegutils/jpegutils.h http://commits.kde.org/digikam/60b3d50b19920499cc34814e37da4fa229252589 |