Bob Meetin on wrote...
| Sorry but I'm not familiar with what banding means. I looked at your
| gradient. It looks good but if it were a little wider it would be easier
| to tell. The version I'm running is whatever is available on the
| hosting server; the hosting company has it locked down so I cannot
| run/check convert via a shell command.
|
| For what it's worth, I made up a php script to create gradients. See
| and compare results at:
|
| www.dottedi.biz/tools/gradient_generator.php
|
| What is being generated is/was not impeccably smooth. I'm viewing it on
| a standard widescreen monitor at 1280x768 res. However, I changed the
| monitor setting color quality from 16 to 32 bit and that makes a world
| of difference. I'm not a hardware type - what would be the default
| setting of most monitors coming from the factory?
|
| The .gif version which I'm seeing now is 'fair' quality but the .jpg and
| .png are much better.
|
| -Bob
|
|
| Ross Presser wrote:
| > I think I spoke too soon. While it's true that there is a 256 color
| > limitation to GIF and that puts an upper limit on the smoothness, your
| > result has definite banding. Like someone else who responded, I ran
| > your command myself today with IM 6.3.3 04/20/07 Q16 and got this
| > gradient:
| >
| > http://rpresser.googlepages.com/gradient.gif
| >
| > (yikes! Google says my site's bandwidth is exceeded. Oh well....
| > suffice to say that the gradient is smooth to the limits of
| > visibility.)
| >
| > Anthony's answer about color quantization is more likely correct. What
| > version of IM are you using?
| >
| > On 7/18/07, Bob Meetin <[EMAIL PROTECTED]> wrote:
| >> Ross, That makes perfect sense. Here's a sort of related question. I
| >> was messing around this afternoon. If I create a gradient from
| >> white/black, white/red, they work fine, but if I do something extreme
| >> like black/red, I end up with an almost rainbow-ish transition
| >> sandwiched in between the black/red. Any idea? I can post to the group
| >> list tomorrow. -Bob
| >>
| >> Ross Presser wrote:
| >> > GIF is limited to 256 colors (8 bits per pixel). You've specified a
| >> > height of 600 rows. There is no way to get any smoother than what
| >> > you've got.
| >> >
| >> > Try using PNG, or another 24 bits per pixel image format.
| >> >
| >> > On 7/17/07, Bob Meetin <[EMAIL PROTECTED]> wrote:
| >> >> I'm using the following to create a gradient:
| >> >>
| >> >> convert -size 10x600 gradient:#000-#fff gradient.gif
| >> >>
| >> >> It creates the image fine, but the transition is not smooth See
| >> >> sample at:
| >> >>
| >> >> http://dottedi.biz/codesamples/themes2/graphics/img.gif
| >> >>
| >> >> I used 100x600 in this sample to make it easier to visualize the
| >> >> problem. What option do I use to make this a smoother transition
| >> >> gradient?
| >> >>
| >> >> -Bob
| >> >>
| >> >> _______________________________________________
| >> >> Magick-users mailing list
| >> >> [email protected]
| >> >> http://studio.imagemagick.org/mailman/listinfo/magick-users
| >> >>
| >> >
| >> >
| >>
| >>
| >>
| >
| >
|
|
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Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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