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Incorporate a few upstream doc changes; grammar police; wordsmithing; Move -arithmetic into "switches for advanced users"; Additional documentation for IDCT scaling extensions

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@765 632fc199-4ca6-4c93-a231-07263d6284db
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DRC
2012-01-31 10:19:29 +00:00
parent 7ab0364a37 5829cb2398
commit 66a69f04c6
6 changed files with 37 additions and 34 deletions
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5
libjpeg.txt
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@@ -983,7 +983,7 @@ int q_scale_factor[NUM_QUANT_TBLS]
See rdswitch.c and cjpeg.c for an example of usage.
Note that the q_scale_factor[] values use "linear" scales, so JPEG
quality levels chosen by the user must be converted to these scales
using jpeg_quality_scaling(). Here is an example which corresponds to
using jpeg_quality_scaling(). Here is an example that corresponds to
cjpeg -quality 90,70:
jpeg_set_defaults(cinfo);
@@ -1019,7 +1019,8 @@ The actual dimensions of the JPEG image that will be written to the file are
given by the following fields. These are computed from the input image
dimensions and the compression parameters by jpeg_start_compress(). You can
also call jpeg_calc_jpeg_dimensions() to obtain the values that will result
from the current parameter settings.
from the current parameter settings. This can be useful if you are trying
to pick a scaling ratio that will get close to a desired target size.
JDIMENSION jpeg_width Actual dimensions of output image.
JDIMENSION jpeg_height