使用convert将一个图像插入另一个图像

Question

我有一张大小为logo.png的{​​{1}}图像，我希望它能够被拉伸或挤压以适应整个高度或宽度，保留纵横比，居中于有界矩形720x720内和top-left: 32,432在另一张bottom-right: 607,919尺寸为background.png的图片中。{/ p>

因此，对于上面的示例，640x960会调整为logo.png，并定位在488x488。

但我不想计算top-left: 76,432或488x488，只想使用上面的76,432和top-left说明符，即让ImageMagick弄明白

ImageMagick可以这样做吗？如果它本身不能，是否有使用bottom-right和其他任何内容的脚本解决方案？

Answer 1

希望更简单的版本

我认为这仍然会产生相同的结果，但更简单：

#!/bin/bash

# Make initial images
convert -size 720x720! gradient:red-yellow -fill white -gravity center -pointsize 72 -annotate 0 "logo" logo.png
convert -size 640x960! gradient:blue-cyan  -fill white -gravity north  -pointsize 72 -annotate 0 "background" background.png

# Specify top-left and bottom-right
tl="32,432"
br="607,919"

# Get x1,y1,x2,y2 - bounding box of inserted image
IFS=, read -r x1 y1 <<< "$tl"
IFS=, read -r x2 y2 <<< "$br"

# Work out width and height 
w=$((x2-x1+1))
h=$((y2-y1+1))

# Resize logo proportionally, then extend canvas with invisible pixels to full size of insertion area and composite onto background
convert background.png \( logo.png -resize ${w}x${h} -background none -gravity center -extent ${w}x${h} \) -gravity northwest -geometry +${x1}+${y1} -composite result.png

改善答案

这更简单，更快，希望结果相同：

#!/bin/bash

# Make initial images
convert -size 720x720! gradient:red-yellow -fill white -gravity center -pointsize 72 -annotate 0 "logo" logo.png
convert -size 640x960! gradient:blue-cyan  -fill white -gravity north  -pointsize 72 -annotate 0 "background" background.png

# Specify top-left and bottom-right
tl="32,432"
br="607,919"

# Get x1,y1,x2,y2 - bounding box of inserted image
IFS=, read -r x1 y1 <<< "$tl"
IFS=, read -r x2 y2 <<< "$br"

# Work out w and h, and smaller side "s"
w=$((x2-x1+1))
h=$((y2-y1+1))
s=$w
[ $h -lt $w ] && s=$h
echo Smaller side: $s

# Resize logo proportionally, then extend canvas with invisible pixels to full size of insertion area and place on background
convert background.png \( logo.png -resize ${s}x${s} -background none -gravity center -extent ${w}x${h} \) -gravity northwest -geometry +${x1}+${y1} -composite result.png

原始答案

我认为，根据您的评论，您希望调整大小的图像居中，所以我已经完成了。

此外，还有很多调试代码，我还没有优化它，直到我知道我在正确的轨道上，所以它肯定可以改进。

#!/bin/bash

# Make initial images
convert -size 720x720! gradient:red-yellow -fill white -gravity center -pointsize 72 -annotate 0 "logo" logo.png
convert -size 640x960! gradient:blue-cyan  -fill white -gravity north  -pointsize 72 -annotate 0 "background" background.png

# Specify top-left and bottom-right
tl="32,432"
br="607,919"

# Get x1,y1,x2,y2 - bounding box of inserted image
IFS=, read -r x1 y1 <<< "$tl"
IFS=, read -r x2 y2 <<< "$br"

# Work out w and h, and smaller side "s"
w=$((x2-x1+1))
h=$((y2-y1+1))
s=$w
[ $h -lt $w ] && s=$h
echo Smaller side: $s

# Work out size of resized image
read -r a b < <(convert logo.png -resize ${s}x${s} -format "%w %h" info:)
echo Resized logo: $a x $b

# Work out top-left "x" and "y"
x=$((x1+((w-a)/2)))
y=$((y1+((h-b)/2)))
echo x:$x, y:$y
convert background.png \( logo.png -resize ${s}x${s} +repage \) -geometry +${x}+${y} -composite result.png