| Summary: | PRINT : option for setting the size in DPI | ||
|---|---|---|---|
| Product: | [Applications] digikam | Reporter: | Dik Takken <kde> |
| Component: | Plugin-Editor-Print | Assignee: | Digikam Developers <digikam-bugs-null> |
| Status: | CONFIRMED --- | ||
| Severity: | wishlist | CC: | caulier.gilles, languitar |
| Priority: | NOR | ||
| Version: | 0.9.4 | ||
| Target Milestone: | --- | ||
| Platform: | Gentoo Packages | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
|
Description
Dik Takken
2008-07-04 22:59:55 UTC
True. Could be put into resize dialogs. Without changing size dimensions you could change only dpi. This would be good place also due to resizing of images for web purposes (72 dpi). I just fixed the batch resize plugin in kipi-plugins. Does this solve this issue? I don't think he is talking about the resize batch plugin, but the builtin-one. 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
Gilles Caulier
Oups, sorry, wrong post in comment #4. Please ignore... Gilles Caulier I was not referring to the batch resize plugin here. I'd use it mainly for resizing an image for printing to an output device with known DPI and paper size. Maybe this would be a nice feature for a print preparation dialog. Preparing an image for printing involves some more steps that might fit into a special purpose dialog, like: * Resize to match output DPI, paper size and printer margins * Add white or black border to create a margin between image and paper edges * Unsharp masking to compensate for slight blurring on certain printers (especially continuous tone printers) But for a start, not having to grab a calculator would be nice. :) |