Pentax Browser 2.0 - Manual (Page 101)

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Lossless rotation
Because JPEG uses irreversible compression (data is lost during
compression), the quality of JPEG images deteriorates when
uncompressed, rotated and then saved. Lossless rotation, however, can
be used to rotate JPEG images without recompressing the data. Exif and
other data are maintained. Images for which lossless rotation is performed
are processed as separate files; the rotated image appears after the image
file is saved.
PNG format
Images saved using this format can be compressed to a small file size, but
the reversible compression of this format makes the file size larger than
JPEG. This format is for use with full-color images and prevents quality
loss even when re-edited. PNG files, however, cannot be viewed on older
browsers (Internet Explorer 3.0 or earlier or Internet Explorer 4.5 on
Macintosh). In addition, thumbnail images and image properties cannot be
embedded in the data.
sRGB (standard RGB)
An international color space standard defined by IEC (International
Electrotechnical Commission). This is defined from color space for
computer monitors and is also used as the standard color space for Exif.
TIFF-8
A file format for saving image data. Each image is recorded with 8-bit RGB
data for each color. The image is not compressed making the file size
large, but no deterioration of image quality occurs.
TIFF-16
Although TIFF images are usually 8-bit, this is a 16-bit TIFF. More
computations are required when image processing as the dynamic range
is larger.