On Tue, 23 Dec 2008 17:06:37 +0700
"Vu The Cuong" <[email protected]> wrote:
| Hi,
|
| I have a couple of questions for you:
|
| Below command generates gradient for text (not for background) for me.
|
| convert -size 850x80 gradient:white-blue \
|
| -font HoboBT-Regular -pointsize 70 -tile gradient:blue-red \
|
| -annotate +10+65 'Add Fonts to ImageMagick!' gradients.jpg
|
|
|
| 1) About "gradient:" prefix operator, (ex: gradient:white-blue),
|
| which command allow me how can I retrieve information about how many
| operator begins with gradient: prefix
|
| and what are they?
|
The "gradient:" is a reference to a image format coder.
These are modules which are generally used to read specific file formats
such as PNG: JPG: and MIFF:
Some special formats return internal images such as
rose: logo: granite:
However there are some special ones too such as tile:{image} which
reads the image and tiles it into a image if "-size" dimentions. And
pattern: which is another tiler but of a seperate set of built in tile
patterns.
Some coders read from special sources such as X: which does a screen
snapshot under user control.
Also there are 'fake' formats that just create the images mathematically.
These include
gradient: plasma: xc:
For a list and references to information on these look at
Offical page of formats (coders)
http://www.imagemagick.org/script/formats.php
IM Examples pages
http://www.imagemagick.org/Usage/files/
http://www.imagemagick.org/Usage/formats/
http://www.imagemagick.org/Usage/canvas/
and a index at...
http://www.imagemagick.org/Usage/reference.html#formats
| 2) Above command example have gradient:blue-red which combines 2 colors
| (blue and red),
|
| Is there any operator allowing me to combine 3 colors or more on
| generating gradient for text?
|
| If no such operator, what is simplest way to generate gradient consists
| of 3 colors for text?
|
generate an image (any image) say using xc:
Then use -sparse-colors operator or recolor it with complex gradient
from user supplied color points
http://www.imagemagick.org/Usage/canvas/#sparse-color
| 3) Could you show me some commands to generate gradient consists of 3
| colors for text?
|
Generate your text as a black and white image, and combine it with
color images...
See IM Examples, Text to Image Handling, Annotate
http://www.imagemagick.org/Usage/text/#annotate
and look for "Coloring a Gray-scale Text Image"
That will give you a starting point and references to more detail
about using the text as a color template combining color images.
Anthony Thyssen ( System Programmer ) <[email protected]>
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