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GIF
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... Although the initial motivation for developing PNG was to replace
GIF, the design provides some useful new features not available in
GIF, with minimal cost to developers.
...
... GIF, the design provides some useful new features not available in
GIF, with minimal cost to developers.
GIF ...
... image
Comment Miscellaneous comment; conversion from
GIF comment
For the Creation Time keyword, the date format defined in
...
... necessary to store multiple images within one file; for example,
this is needed to convert some GIF files. In the future, a
multiple-image format based on PNG ...
... TIFF 6.0 files can optionally store
calibration information, which if present should be used to
construct the cHRM chunk. GIF and most other formats do not store
any calibration information.
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... Does the world really need yet another graphics format? We
believe so. GIF is no longer freely usable, but no other commonly
used format can directly replace it, as is discussed in more
detail below. We might have used an adaptation of an existing
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... used format can directly replace it, as is discussed in more
detail below. We might have used an adaptation of an existing
format, for example GIF with an unpatented compression scheme.
But this would require new code anyway; it would not be all that
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... compression engine, which would be needed in any case.) We feel
that this is an excellent opportunity to design a new format that
fixes some of the known limitations of GIF.
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... PNG are intended to address the needs of
applications that previously used the special strengths of GIF.
In particular, GIF is well adapted for online communications
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... applications that previously used the special strengths of GIF.
In particular, GIF is well adapted for online communications
because of its streamability and progressive display capability.
PNG ...
...
We have also addressed some of the widely known shortcomings of
GIF. In particular, PNG supports truecolor images. We know of no
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... images are displayed against a background or together with
other images. GIF provided a simple transparent-color
specification for this purpose. PNG supports a full alpha channel ...
... PNG.
GIF is no longer suitable as a universal standard because of legal
entanglements. Although just replacing GIF's compression method ...
... GIF is no longer suitable as a universal standard because of legal
entanglements. Although just replacing GIF's compression method
would avoid that problem, GIF ...
... GIF's compression method
would avoid that problem, GIF does not support truecolor images,
alpha channels ...
... PNG's two-dimensional interlacing scheme is more complex to
implement than GIF's line-wise interlacing. It also costs a
little more in file size. However, it yields an initial image
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... little more in file size. However, it yields an initial image
eight times faster than GIF (the first pass transmits only 1/64th
of the pixels, compared to 1/8th for GIF). Although this initial
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... eight times faster than GIF (the first pass transmits only 1/64th
of the pixels, compared to 1/8th for GIF). Although this initial
image is coarse, it is useful in many situations. For example, if
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... PNG's first pass is often enough to determine where to
click. The PNG scheme also looks better than GIF's, because
horizontal and vertical resolution never differ by more than a
factor of two; this avoids the odd "stretched" look seen when
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... image is typically readable about twice as fast as in an
equivalent GIF, i.e., after PNG's fifth pass or 25% of the image
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... PNG's fifth pass or 25% of the image
data, instead of after GIF's third pass or 50%. This is again due
to PNG's more balanced increase in resolution.
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... image gamma values around 1.0 and around 0.5 are both
widely found. Older image standards such as GIF often do not
account for this fact. The JFIF standard specifies that images in
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