问题

I've been using ImageMagick, but it produces a very blurry result.

convert -density 300 ../images/favicons/procensus.svg -background transparent -colors 256 -define icon:auto-resize favicon2.ico

It seems to be rendering the image at 300 density, then resizing that with a Gaussian filter for all the other sizes in the icon.

What I actually want it to do is re-render with shape-rendering="crispEdges" at each pixel size in the favicon.

I want ImageMagick (or whatever other tool) to re-render the SVG at each provided density of .ico.

Note that this tool should only be a tool I can use at package build time: an open-source piece of installable software for Linux.

回答1:

Using a test SVG, I managed to get a multi-size ico file with this command - you can change the sizes as necessary.

convert procensus.svg -bordercolor white -border 0 \
      \( -clone 0 -resize 16x16 \) \
      \( -clone 0 -resize 32x32 \) \
      \( -clone 0 -resize 48x48 \) \
      \( -clone 0 -resize 64x64 \) \
      -alpha off -colors 256 favicon.ico

回答2:

Requirements

On a UNIX-like operating system (Linux, MacOS, etc.), download and install the following:

ImageMagick
rsvg-convert
pngquant

Script

Save the following as build.sh:

#!/bin/bash

# Relative path to location of SVG file to make into ICO file.
ICON_PATH=../../images/edible.svg

ICON_BASE=$(basename "$ICON_PATH")
ICON_DIR=$(dirname "$ICON_PATH")
ICON_FILE="${ICON_BASE%*.}"
ICON_EXT="${ICON_BASE##*.}"

FAVICON_FILE=favicon
FAVICON_EXT=.ico

# This uses rsvg-convert to create crisp PNG icons.
for size in 16 32 64 128 150 192 512; do
  ICON_OUT=$ICON_FILE-${size}.png
  DIMENSIONS=${size}x${size}
  rsvg-convert -w $size -p 300 -d 300 $ICON_PATH > $ICON_OUT

  # Use ImageMagick to center the image and make it square.
  convert $ICON_OUT -gravity center -background transparent \
    -resize $DIMENSIONS -extent $DIMENSIONS temp-$ICON_OUT

  # Use 8-bit colour to reduce the file size.
  pngquant 256 < temp-$ICON_OUT > $FAVICON_FILE-$DIMENSIONS.png
done

# Merge the 16- and 32-pixel versions into a multi-sized ICO file.
convert \
  $FAVICON_FILE-16x16.png \
  $FAVICON_FILE-32x32.png \
  -colors 256 ../$FAVICON_FILE$FAVICON_EXT

# Create Android icons.
mv $FAVICON_FILE-192x192.png android-chrome-192x192.png
mv $FAVICON_FILE-512x512.png android-chrome-512x512.png

# Create MS tile icon.
mv $FAVICON_FILE-150x150.png mstile-150x150.png

# Clean up the temporary files.
rm ${ICON_FILE}*png temp-${ICON_FILE}*png

Edit the file and change the ICON_PATH variable to the location of the SVG file to convert, such as:

ICON_PATH=../images/favicons/procensus.svg

Run the script:

./build.sh

Various icons are created in the current directory.

Note: Be sure to backup your files before running this command as it will erase the PNG files it creates while processing.

Browser Config

Save the following file as browserconfig.xml:

<?xml version="1.0" encoding="utf-8"?>
<browserconfig>
    <msapplication>
        <tile>
            <square150x150logo src="/mstile-150x150.png"/>
            <TileColor>#da532c</TileColor>
        </tile>
    </msapplication>
</browserconfig>

回答3:

I've got it working configuring shape-rendering="crispEdges" and doing:

sudo apt install libbatik-java
rasterizer favicon.svg -d favicon-16.png -h 16 -w 16
rasterizer favicon.svg -d favicon-32.png -h 32 -w 32
rasterizer favicon.svg -d favicon-48.png -h 48 -w 48
rasterizer favicon.svg -d favicon-64.png -h 64 -w 64

convert favicon-16.png favicon-32.png favicon-48.png favicon-64.png favicon.ico

But it looks like image magick doesn't support that attribute.

I'm still looking for more elegant answers.

来源：https://stackoverflow.com/questions/39256104/how-to-convert-an-image-file-from-svg-to-a-multi-size-ico-without-blur-sharp

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svg