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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2015-05-30 22:52:12 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2015-05-30 22:52:12 +0000 |
| commit | c2f2cab0a93d14686b5b83e8105db9ff71d27456 (patch) | |
| tree | b477dc0175b5838796fa54f15ef7d55b507aaafe /extendedopacity.html | |
| parent | d7ca777a4198befe1dc1a15135960669b190dd2f (diff) | |
| download | netpbm-mirror-c2f2cab0a93d14686b5b83e8105db9ff71d27456.tar.gz netpbm-mirror-c2f2cab0a93d14686b5b83e8105db9ff71d27456.tar.xz netpbm-mirror-c2f2cab0a93d14686b5b83e8105db9ff71d27456.zip | |
miscellaneous update
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@2538 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'extendedopacity.html')
| -rw-r--r-- | extendedopacity.html | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/extendedopacity.html b/extendedopacity.html index b99e770e..4205cd8c 100644 --- a/extendedopacity.html +++ b/extendedopacity.html @@ -63,7 +63,7 @@ To control image brightness, we use pure black as the degenerate (zero alpha) image. Interpolation darkens the image, and extrapolation brightens it. In both cases, brighter pixels are affected more. -<img src="blend1.gif" alt="brightness" width=469 height=154> +<img src="blend1.gif" alt="brightness" width="469" height="154"> <h3>Changing Contrast</h3> <p> @@ -72,7 +72,7 @@ luminance. Interpolation reduces contrast and extrapolation boosts it. Negative alpha generates inverted images with varying contrast. In all cases, the average image luminance is constant. -<img src="blend3.gif" alt="contrast" width=469 height=154> +<img src="blend3.gif" alt="contrast" width="469" height="154"> <p> If middle gray or the average pixel color is used instead, contrast is again altered, but with middle gray or the average color left unaffected. @@ -89,7 +89,7 @@ an interactive application is especially fast, since the luminance of each pixel need not be recomputed. Negative alpha preserves luminance but inverts the hue of the input image. -<img src="blend4.gif" alt="saturation" width=469 height=154> +<img src="blend4.gif" alt="saturation" width="469" height="154"> <h3>Sharpening an Image</h3> <p> @@ -104,7 +104,7 @@ the size of the kernel. Since blurring, unlike sharpening, is often a separable operation, sharpening by extrapolation may be far more efficient for large kernels. -<img src="blend6.gif" alt="sharpening" width=469 height=154> +<img src="blend6.gif" alt="sharpening" width="469" height="154"> <p> Note that global contrast control, local contrast control, and sharpening form a continuum. @@ -120,7 +120,7 @@ An unusual property of this interpolation/extrapolation approach is that all of these image parameters may be altered simultaneously. Here sharpness, tint, and saturation are all altered. -<img src="blend7.gif" alt="combined" width=469 height=154> +<img src="blend7.gif" alt="combined" width="469" height="154"> <h3>Conclusion</h3> <p> @@ -156,7 +156,7 @@ Interpolation and Extrapolation</cite>. IRIS Universe Magazine No. 28, Silicon Graphics, Aug, 1994. <p> -<img src=gobot.gif alt="" width=564 height=25 border=0> +<img src="gobot.gif" alt="" width="564" height="25" border="0"> </body> </html> |