png

How to scan barcode in JPEG format with zbar in Linux?

How to scan barcode in JPEG format with zbar in Linux? I am working on an embedded Linux system (kernel-5.10.24). Now I am trying to use zbar-0.23 to scan barcodes in JPEG format, but I don’t know how to do that. There is an example/scan_image.c, which can scan barcodes in PNG format, but my barcodes …

Total answers: 1

difference between convert -quality and convert -resize and convert -density

difference between convert -quality and convert -resize and convert -density I’m trying to reduce file size of a .png in the terminal with Imagemagick convert Does anyone know the difference between convert -quality , convert -resize and convert -density ? convert -quality does not seem to work at all, whether you give it 99, 30, …

Total answers: 1

Trouble with batch conversion of .png to .pdf using convert

Trouble with batch conversion of .png to .pdf using convert convert /home/bill/TempScan/*.png myfile.pdf gives error message: convert-im6.q16: not authorized `myfile.pdf’ @ error/constitute.c/WriteImage/1037. Any help would be appreciated! Asked By: bill-lancaster || Source convert is a powerful command line tool to convert graphics. Its support for PDF is provided by Ghostscript. Because of a significant security …

Total answers: 5

How to get the DPI of an image file (PNG)

How to get the DPI of an image file (PNG) If I export an image with lets say 300 DPI and I read out its meta-info with any application that can do it (like file, exiftool, identify,mediainfo etc.), I always get a value showing Image-Width and Image-Height. In this case: 2254 x 288 how do …

Total answers: 3

How can I compress image PNG And JPG images?

How can I compress image PNG And JPG images? How can I compress PNG and JPG images by more than 50%? Asked By: Hideki Nishimura || Source There is a handy tool called mogrify that enables to do all sort of batch operations with images. How to reduce quality of photos: Put all of them …

Total answers: 1

ImageMagick PNG delegate install problems

ImageMagick PNG delegate install problems Ubuntu 14.04: I’ve downloaded the latest imagemagick source and installed, using option below to configure: root@usve59445:~/im/ImageMagick-6.9.3-7# ./configure –enable-shared –with-png=yes After installation however, I have zero items in my built-in list of delegates: root@usve59445:~/im/ImageMagick-6.9.3-7# identify -version Version: ImageMagick 6.9.3-7 Q16 x86_64 2016-03-14 Copyright: Copyright (C) 1999-2016 ImageMagick Studio LLC License: Features: …

Total answers: 3

Convert Xcursor to PNG

Convert Xcursor to PNG Xcursor is a format for the graphics of the cursor in X11 (file reports X11 cursor). xcursorgen allows you to convert PNG files and some metadata to Xcursor files. How do I convert an Xcursor file to PNG images? Imagemagick’s convert unfortunately returns: no decode delegate for this image format Asked …

Total answers: 1

Image viewer that shows transparent as white or different color, not as checkered

Image viewer that shows transparent as white or different color, not as checkered I have made a number of graphical mockups in SVG, and then exported them to PNG. They all have transparent background, because that makes sense in my case. However, it isn’t easy to browse through the PNG-files. Both Gwenview and Gnome Image …

Total answers: 3

How to modify multiple images in terminal?

How to modify multiple images in terminal? I need to invert multiple .png images from black to white using command line. I have found that I might use gimp plugin “plug-in-vinvert” but I can not figure out how to use it. I have tried something like gimp -b ‘(plug-in-vinvert “INT32” “filename.png” “/resultsFolder/”)’ and many other …

Total answers: 3

How to install libpng and zlib

How to install libpng and zlib I’m completely new to Ubuntu. I got installed it because my school uses a lot of Linux type stuff in my school’s Computer Science program so I figured I would use Ubuntu on my own machine and just do my code from there instead of the computer labs. However, …

Total answers: 2

How do I convert a PNG to SVG, using software?

How do I convert a PNG to SVG? I’d like to be able to crop SVG chemical structures, completely (see this question), that were created using MarvinSketch and I think I might have thought of a solution; I use MarvinSketch to create a large PNG file, then crop that using GIMP, and then convert the …

Total answers: 5

Bulk converting images from one format to another?

Bulk converting images from one format to another? I want to convert a batch of images, nearly 100, from jpg to png format. How can I do this without renaming them, but instead actually converting the format? Asked By: opu 웃 || Source Try these commands, mogrify -format png /path/*.jpg This will convert all the …

Total answers: 4

How to create a png with transparent background in inkscape?

How to create a png with transparent background in inkscape? Is it possible? A PNG usually consumes less storage space compared to an SVG. Sometimes I need small sized images in sites like Launchpad. When I simply save as PNG, the background remains white, not transparent. Asked By: Archisman Panigrahi || Source That’s actually Inkscape’s …

Total answers: 2

How to convert multiple XCF files to PNG?

How to convert multiple XCF files to PNG? I have a folder with a lot of xcf files which I want all to be converted to png files, at best via a one-liner from bash. How can I achieve such a task? Asked By: k0pernikus || Source One-liner from bash: for i in *.xcf; do …

Total answers: 5

Is there a way to batch export SVGs to PNGs?

Is there a way to batch export SVGs to PNGs? I have these SVGS and I’d like to export them to PNG images, I could export them with Inkscape but that would mean open each file and export that file to PNG which is not efficient (I have hundreds of them). How can I do …

Total answers: 5