I have a bunch of PNG images (logos) that I want to convert to an all-white color pallet; basically I want to replace all non-transparent pixels with white pixels. Is there an easy way to do this in imagemagick?
You can do that in ImageMagick using -colorize.
convert input.png -fill white -colorize 100 output.png
It will preserve the transparent pixels and make everything else white.
Related
I have an image that all four margins are transparent alpha channels and I want to crop all margins and only keep the non-alpha channel parts. Is there any way to do it with ImageMagick? Take this image as an example but consider its transparent margins!
You can do that in Imagemagick using -trim to automatically remove the constant transparent regions.
convert img.png -trim +repage result.png
I have a small icon GIF that I would like to change the color. All opaque GIF pixels should be replaced by this new color, but preserve transparency for the gif. Then I need to place that new colored GIF over a background map, all in one command line. Here is what I have, but it's not changing all gif opaque pixels. Attached is the GIF icon. (Edit: I know im only targeting the white here, but just can't figure out how to target ALL opaque pixels in the GIF)
exec("{$convert} {$map_image} \( {$map_icon} -fill orange -opaque white -geometry +1700+600 \) -composite map2.jpg ");
Use +opaque none to fill all non-transparent colors in ImageMagick. The +opaque means everything "but" that color.
convert grid.gif -fill orange +opaque none x.png
I've a png image containing transparent pixels and colored pixels (mainly white).
I'd like to transform all transparent pixels to white pixels and all white pixels to transparent pixels within a given rectangle.
My idea would be to
convert the white pixels to red
the transparent colors to white
and the red colors to transparent
. Here' s my code:
1) convert ldl_0.png -fuzz 10% -fill red -opaque white lx.png
2) convert lx.png -background white -alpha remove -alpha off lx2.png
However I can' t figure out how do I transform red colors to transparent. How do I do that?
Also how can I force to do this only within a given rectangle?
Thank You.
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Try this in ImageMagick. Negate the alpha channel and turn the whole RGB channels to white.
convert in.png -channel a -negate +channel -fill white -colorize 100 out.png
I'm trying to create icons (.ico format) with ImageMagick with only partial success. I can't get the resulting icon to have any transparency. I've tried many things like -alpha Background, -quantize transparent, -transparent-color, but I just can't get it working.
I can get it working if I don't reduce the colors -colors 256. It's with that reduction where I lose the transparency.
How do you produce a transparent icon with image magick (convert)?
I generate transparent PNGs with the -alpha transparent option. For example:
convert -size 100x100 -alpha transparent \
-stroke black -strokewidth 5 -fill blue \
-draw "rectangle 20,20,80,80" \
xc:#990000 test.png
This creates test.png with a floating blue box with a black border, inside an image with a transparent background. It uses a block colour as the "input" image , but the red is obliterated by the full transparency of its channel.
If you remove the alpha, you'll see the red source image.
Had the same problem when trying to generate a transparent favicon from transparent PNGs. Here's what worked for me:
convert transparent-img1.png transparent-img2.png transparent-img3.png -channel Alpha favicon.ico
I want to create a .png file which is just a solid color.
This must be easy to do using ImageMagick but I can't figure out the problem:
C:\tmp>convert -size 8x16 -stroke black -fill black -draw "rectangle 0,0,8,16" black.png
Magick: missing an image filename `black.png' # error/convert.c/ConvertImageComm
and/3016.
Obviously there can be more options, like borders and etc, but if you just want an image of width x height of a given hex color, it's pretty straight forward.
Here's all it takes to make an 100x100 image of a solid dark red:
convert -size 100x100 xc:#990000 whatever.png
Note that for rgb and rgba values, you need to escape the parentheses. Building on #Mike Flynn and #luk3thomas (who correctly escapes the color code):
convert -size 100x100 xc:rgb\(0,255,0\) whatever.png
convert -size 100x100 xc:rgba\(0,255,0, 0.4\) whatever.png
In Mac
convert -size 100x100 xc:"#8a2be2" blue#2x.png