I want to rotate PNG file by convert command.
like this.
convert -background 'rgba(0,0,0,0.5)' -rotate 45 1.png r1.png
But result PNG file is wrong like following.
https://docs.google.com/spreadsheet/ccc?key=0AqzGWe_mT6dwdEIwa04xRldwVGtOX1VGbVJhRnZwX0E
The gray space is correct.
I don't know why black space exists.
What am I wrong?
thank you.
convert -version
Version: ImageMagick 6.5.4-7 2012-05-07 Q16 OpenMP http://www.imagemagick.org
Copyright: Copyright (C) 1999-2009 ImageMagick Studio LLC
The image to modify comes straight after convert.
Try:
convert 1.png -background "rgba(0,0,0,0.5)" -rotate 45 r1.png
This worked for me
$ convert 1.png -distort SRT -ANGLE_IN_DEGREES -gravity center r1.png
Related
The following is giving me a blank image of the expected size:
magick convert a.png b.png -compose difference -composite out.png
However, I can produce the correct output as a jpg:
magick convert a.png b.png -compose difference -composite out.jpg
I then tried to convert this to a png and it works fine:
magick convert out.jpg out.png
Why is the first command giving me a blank image and how might I fix the problem?
Libpng version 1.6.37.
Version: ImageMagick 7.0.11-8 Q16 x86_64 2021-04-17 https://imagemagick.org
Copyright: (C) 1999-2021 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP(4.5)
Delegates (built-in): bzlib freetype gslib heic jng jp2 jpeg lcms lqr ltdl lzma openexr png ps tiff webp xml zlib
UPDATE:
Bmp is also blank:
magick convert a.png b.png -compose difference -composite out.bmp
And this also works for jpg but not png:
composite -compose difference a.png b.png out.png
And this is what I see when running verbose:
a.png PNG 500x700 500x700+0+0 8-bit sRGB 125771B 0.030u 0:00.016
b.png PNG 500x700 500x700+0+0 8-bit sRGB 90207B 0.020u 0:00.012
a.png=>b.png PNG 500x700 500x700+0+0 8-bit sRGB 90207B 0.450u 0:00.084
This is working and is giving my the required output:
composite -verbose -compose minus a.png b.png out.png
I am trying to make video from images. First i create images with imagemagick (simple version):
convert -background transparent -size 1280x720 -gravity center
caption:'text' 0.png
then ffmpeg(simple version):
ffmpeg -framerate 0.5 -i 0.png debug.mp4
and this is what happens: http://prntscr.com/qy5i08 do you see the difference? Image and video resolution is the same 1280x720
I used another png image not created with imagemagick and there is no difference. Why is that?
The issue was -background transparent
When using background black than the quality is normal.
How I can remove background color from image using GraphicsMagick? I need to delete rgb(255,255,255) and rgb(254,254,254) colors from image and replace them to transparency.
Thank you.
you should tinker with fuzz -parameter to match #fefefe
gm convert in.png -fuzz 3% -transparent "#ffffff" out.png
Should comment but cannot.
gm convert -geometry 50x50! -background white -extent 0x0 +matte in.png out.jpg or
gm convert -background color -extent 0x0 +matte src.png dst.png
I am cropping and blurring a 960x960px image to 960x416 using GraphicsMagick:
gm convert -resize 960x416^ -gravity center -crop 960x416+0+0 +repage in.jpg bg.png
gm mogrify -gaussian 25x10 bg.png
After that, I create a 200x200px thumbnail of same initial image:
gm convert -resize 200x200 in.jpg top.png
On the last step, I combine both images, where the thumbnail will be placed on the top left position of the background image:
gm composite top.png bg.png -geometry 960x416+50+16 out.jpg
This works like a charm. But what I now need is a automatically generated dropshadow for the image top.png when it will be composited on the top of the bg.png in the last step. Is this possible?
I want to use Imagemagick to add a transparent gradient from the left and right to be composed with an image.
I can generate the image with:
convert -size 100x100 gradient: -function Polynomial -4,4,0 -distort SRT 90 gradient.png
And it looks like:
I can also compose that image on top of the image I want with:
composite original.jpg -compose Multiply gradient.png final_image.jpg
All of this works fine. My question is, how do I change the color of that gradient?
Thanks!
Simply add comma-separated colors after gradient: option:
convert -size 100x100 gradient:white,blue -function Polynomial -4,4,0 -distort SRT 90 gradient.png
Note, that -function converts channels too, so colors in gradient wont be original.
Found a way around this by doing
convert input.jpg -alpha set -virtual-pixel transparent -background red -channel A -blur 0x34 -level 75%,100% +channel -flatten final.jpg
which works in my case, giving me: