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file format
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... images of up to 256 colors.
* Streamability: files can be read and written serially, thus
allowing the file format to be used as a communications
protocol for on-the-fly generation and display of images.
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... well as simple, quick detection of common transmission errors.
The main part of this specification gives the definition of the file
format and recommendations for encoder and decoder behavior. An
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... requirement, while "should" indicates recommended behavior.
See Rationale: Why a new file format? (Section 12.1), Why these
features? (Section 12.2), Why not these features? (Section 12.3), Why
not use format X? (Section 12.4).
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... image format based on PNG may be defined. Such a format
will be considered a separate file format and will have a
different signature. PNG ...
... determine what a particular scanner does.
File format converters generally should not attempt to convert
supplied images to a different gamma. Store the data in the PNG ...
... TIFF) that can describe the gamma characteristic of the image. In
such cases, a file format converter is strongly encouraged to
write a PNG gAMA chunk that corresponds to the known gamma of the
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... PNG gAMA chunk that corresponds to the known gamma of the
source image. Note that some file formats specify the gamma of
the display system, not the camera. If the input file's gamma
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... PNG file to see the same image that
the person running the file format converter saw. Although this
may not be precisely the correct value of the image gamma, it's
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... any calibration information.
It is not recommended that file format converters attempt to
convert supplied images to a different RGB ...
... Why a new file format? ...
... compression scheme.
But this would require new code anyway; it would not be all that
much easier to implement than a whole new file format. (PNG is
designed to be simple to implement, with the exception of the
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Most graphics file formats include the ability to store some
textual information along with the image. But many applications
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Traditionally, image file formats have used uncalibrated, device-
dependent color. If the precise details of the original display
device are known, it becomes possible to convert the device-
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