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COMPRESSION RATE / FILE FORMAT
The picture data is recorded either
a. using one of two different JPEG compression rates:
JPEG fine
/
JPEG standard
, or
b. in the
DNG
file format, either compressed or uncompressed, or
c. using combinations of one of the two JPEG compression rates
and the set DNG format, i.e. two files are generated per
picture.
On the one hand this allows you to take account of the intended
usage and the available memory card capacity, and on the other
hand provides the security and flexibility essential for deciding on
the usage later.
Setting the function
Selecting the JPEG compression or format combination
1. In the picture parameters menu (see p. 154/248) select
File format
, and
2. in the respective sub-menu, select the desired compression/
combination.
Selecting the DNG compression
1. In the main camera menu, (see p. 154/248) select
DNG Compression
(page 2,
IMAGE
section), and
2. select the desired option in the relevant sub-menu (
On
=compressed /
Off
=uncompressed).
Notes:
• The standardized DNG (Digital Negative) format is used for
storage of completely unprocessed raw picture data.
• The available compression for DNG format
– is lossless, i.e. it does not cause any deterioration in quality
– retains all of the post-editing performed on the image data
– allows faster saving
– takes up less memory space.
• If simultaneous storage of picture data as DNG and JPEG is
selected, the existing resolution setting is used for the JPEG
format, i.e. the resolutions of the two files can be quite different.
• A high compression rate such as for
JPEG standard
can result
in very fine structures in the subject being lost or incorrectly
reproduced (artifacts; e.g. “stepped” diagonal edges).
• The remaining number of pictures shown in the monitor does not
necessarily change after every picture. This depends on the
subject; with JPEG files very fine structures result in higher
quantities of data, homogeneous surfaces in lower quantities.
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