ImageMagick - Page 2

How to reduce image size. Bulk photo scaling and resizing on the command line

Posted by Alex On August 12, 2022

How to reduce image size You can reduce the image size in several ways: 1. Select lossy image encoding format (JPEG) 2. Increase the level of image compression (for images compressed with loss of quality, this will lead to a deterioration in the appearance of the image, for images compressed without quality loss, this will mean longer processing of the...

How to check JPG quality level (SOLVED)

Posted by Alex On August 5, 2022

This post is about how to find out the quality of a JPG image, as well as other image properties, such as the number of unique colors used in the file, image depth, and other detailed information about JPG and other formats. How to know the quality of a JPG? Is it possible to determine the JPEG quality level? When...

How to convert images to any formats in Linux (SOLVED)

Posted by Alex On July 13, 2022

Universal image converter for Linux Linux has ImageMagick, which supports hundreds of image formats and can convert an image from any format to any other. The “convert” and “magick” utilities from the ImageMagick package do an excellent job of converting images (JPG and other formats). For details on installing ImageMagick, including which dependencies need to be installed to support the...

magick and convert troubleshooting (ImageMagick package)

Posted by Alex On July 12, 2022

The magick (convert) utilities from the ImageMagick package are used to convert and modify images. The magick (convert) commands have many options, although in their basic use, for example, to convert from one format to another, you can do without options at all. Despite the seeming ease of using the magick (convert) utilities, when using them, I encountered a variety...

Error “convert: delegate failed `’potrace’ --svg --output ‘%o’ ‘%i” @ error/delegate.c/InvokeDelegate/1911” (SOLVED)

Posted by Alex On July 7, 2022

Scalable Vector Graphics (SVG) is an XML-based vector image format for defining two-dimensional graphics, having support for interactivity and animation. The SVG specification is an open standard developed by the World Wide Web Consortium (W3C) since 1999. SVG images are defined in a vector graphics format and stored in XML text files. SVG images can thus be scaled in size...

How to convert JPG to PDF

Posted by Alex On April 3, 2022

The article “How to convert PDF to JPG using command line in Linux” shows how to split a PDF file into separate pages while converting them to images. But what if you want to do the opposite? How to assemble JPG images into a PDF file? This article is devoted to this, which will tell you how to create a...

How to convert PDF to JPG using command line in Linux (SOLVED)

Posted by Alex On April 2, 2022

PDF files are not very easy to split into image files in most programs that are used to open these files. However, there are several command line utilities for this. This article will show you how to convert PDF to JPEG on the Linux command line. ImageMagick (convert) To convert PDF to individual image files, let's start with the ImageMagick...

Error “convert: cache resources exhausted” (SOLVED)

Posted by Alex On March 22, 2022

When using the convert utility to convert images, you may encounter an error stating that the cache resources have been exhausted. Command example: convert -density 300 -quality 100 input.pdf output.png An example of the error it causes: convert-im6.q16: cache resources exhausted `/tmp/magick-q7O_IcbbGpFULs5R34rLlwAyeW1slGHi19' @ error/cache.c/OpenPixelCache/4095. This error occurs when two conditions are combined: processing a large file (for example, when converting...

Error “attempt to perform an operation not allowed by the security policy `PDF’” (SOLVED)

Posted by Alex On March 22, 2022

On Debian, Ubuntu, Linux Mint, Arch Linux, and derivative systems, when converting documents from PDF to PNG, an error occurs: attempt to perform an operation not allowed by the security policy `PDF' An example of a command that causes this error: convert -density 300 -quality 100 PL48536179.pdf out.jpg convert-im6.q16: attempt to perform an operation not allowed by the security policy...