Legacy ImageMagick Discussions Archive

cmd:
convert -size 1x250 gradient:black-none -fill "#143fae" -sigmoidal-contrast 6,50% -colorize 100% 3.png

tool url:
http://wirehopper.com/design/gradient.php

Check you IM versions that are installed on each machine. The bad one is probably very very old!

my vesion is the latest vesion 6.7.0 q16

I tried your gradient from the reference page http://wirehopper.com/design/gradient.php and get exactly what IM produced. I don't see any stripes. Did you download the correct result.

From wirehopper:
convert -size 1x250 gradient:black-none -fill "#143fae" -sigmoidal-contrast 6,50% -colorize 100% 3.png

produces a solid blue line and should because you create a gradient, then sigmoid-contrast, and then colorize it 100% with #143fae. So the colorize wipes out all the gradient and overrides it with a solid color.

cmd:
convert -size 10x250 gradient:black-none -fill #143fae -sigmoidal-contrast 6,50% -colorize 100% 3_me.png

not the same? very strange





ps: the 3.png from wirehopper previewed in lister is the same with the top image which had point out, how can the web master create this gredient with php but can't me ?

something must be wrong with your bat file. as I am not windows user I cannot help. but the solid blue line is what you will get from that command. if you want something different, please explain and someone can probably give you the correct command line. If you just want a blue to transparent gradient, then just use:

convert -size 10x256 gradient:blue-none tmp.png

thank you, it seems not so perfect for windows .

linjuming wrote:thank you, it seems not so perfect for windows .

What command is not working correctly in Windows? How is it not correct or the same as what I specified? What is it that you really want for the result?

What is your exact version of IM?

convert -version


Do either of these produce what you want?

convert -size 10x256 gradient:blue-none tmp1.png
convert -size 10x256 gradient:none-blue tmp2.png

my purpose is to create the transparent png with the same preview effect what output with photoshop.
the im created png in my pc is transparent (can see the third img below) ,but can not see the transparent in lister. not the same preview with ps-done png.
not very serious problem ,can use in html will be ok.

vesion:


run in bat


show in html:


ps output :

try these:


convert -size 10x256 pattern:checkerboard gradient:blue-none -flatten tmp1.png

convert -size 10x256 pattern:checkerboard \( gradient:blue-none -channel a -level 30x100% +channel \) -flatten tmp2.png

o no ,you misunderstand the transparent for pattern:checkerboard,they are transparent,not checkbord.

you cannot create an image with a checkerboard to represent transparent and have the checkerboard removed when you overlay the gradient on some image. PS has two kinds of transparency -- background (shown as checkerboard) and alpha channel. IM only uses alpha channel transparency. Thus if you just want to have the image transparent use the original method.

convert -size 10x256 gradient:blue-none tmp1.png

If you need to show it represented with checkerboard behind it, then you have to flatten it together as in

convert -size 10x256 pattern:checkerboard gradient:blue-none -flatten tmp1.png

or

if in an HTML page, use a table cell with a checkerboard background and draw the first image above into the cell.

you cannot create an image with a checkerboard to represent transparent and have the checkerboard removed when you overlay the gradient on some image. PS has two kinds of transparency -- background (shown as checkerboard) and alpha channel. IM only uses alpha channel transparency. Thus if you just want to have the image transparent use the original method.

Thank you, then I finally get the answer.