When working with image processing on Linux systems, you might encounter this error:

bash: convert: command not found

This usually means the ImageMagick package, which provides the powerful convert tool, isn't installed on your RedHat-based system.

For RedHat/CentOS systems, you have several installation options:

Using yum (RedHat/CentOS 7 and below)

sudo yum install ImageMagick ImageMagick-devel

Using dnf (RedHat/CentOS 8+)

sudo dnf install ImageMagick ImageMagick-devel

Verifying the Installation

After installation, verify it works:

convert --version

You should see output similar to:

Version: ImageMagick 6.9.10-68

Basic Image Conversion

convert input.jpg output.png

Resizing Images

convert input.jpg -resize 50% output.jpg

Batch Processing

for file in *.jpg; do convert "$file" -quality 85 "converted_${file}"; done

• If you get policy errors, edit /etc/ImageMagick-6/policy.xml
• For missing delegates (like PNG support), install libpng-devel
• Check dependencies with ldd $(which convert)

If you need the latest version:

wget https://imagemagick.org/archive/ImageMagick.tar.gz
tar xvzf ImageMagick.tar.gz
cd ImageMagick-*
./configure
make
sudo make install

Remember to run sudo ldconfig after installation.

---

The 'convert' command is part of the ImageMagick suite, a powerful toolkit for image manipulation. When you encounter the error "convert: command not found" on RedHat-based systems, it typically means either:

• ImageMagick isn't installed
• Only the newer 'magick' command is available (v7+)
• Required dependencies are missing

For RedHat/CentOS/Fedora systems, use these commands:

# Standard installation
sudo yum install ImageMagick

# For newer systems with dnf:
sudo dnf install ImageMagick

# To include development tools:
sudo yum install ImageMagick-devel

After installation, check the version and available commands:

convert --version
# or for ImageMagick 7+
magick --version

Here are practical examples of using convert:

# Convert JPEG to PNG
convert input.jpg output.png

# Resize image to 50% of original
convert input.jpg -resize 50% output.jpg

# Create thumbnail (200x200 pixels)
convert input.jpg -thumbnail 200x200 thumb.jpg

If you still encounter issues:

• Check your PATH: which convert
• Verify file permissions
• Install missing delegates: sudo yum install ImageMagick-jpeg ImageMagick-png

For systems with ImageMagick 7 where 'convert' was replaced by 'magick':

# Create symbolic link for compatibility
sudo ln -s /usr/bin/magick /usr/bin/convert