Questions tagged [png]

Portable Network Graphics is a bitmapped image format and video codec that employs lossless data compression.

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How can I make files show thumbnails?

Ubuntu 20.04.1 Files shows file names for .png files and possibly others, e.g. .jpg I want it to show thumbnails. I've looked at files > preferences which is set to All Files less than 10Mb, but I'...
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Ubuntu 20 no PNG support (no icons, no screenshots, no png viewing with image viewer)

This is my very first question - hope I'm doing it right. After an update of my system today (8th October 2020) I had a problem with /var/lib/dpkg/status. I could not use apt anymore without getting ...
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Bulk Quality Conversion of Images (ie Compression)

├── ~/ │ ├── content/ │ │ ├── image01.jpg │ │ ├── image02.png │ │ ├── image03.bmp │ │ ├── text-file.txt │ │ ├── video.mp4 │ └── ... └── ... Let's say I want to compress all ...
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443 views

Error in opening png files crc error in chunk idat

I was copying a bunch of png files to a separate folder, which I was going to gzip and then move to a different system. I was able to do that, but all those png files that I transferred are giving a ...
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ImageMagick some cases seemed to fail open

1.) Failed to open image below: $ display WAVES1.png display: ../../magick/quantum.c:216: DestroyQuantumInfo: Assertion `quantum_info != (QuantumInfo *) NULL' failed. Aborted 2.) This seems to ope ...
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fatal error in (chrome) png image file: Write error

[i got png file error and ran this command to resolve it- sudo apt-get install --reinstall libpng*-dev] output of command Reading package lists... Done Building dependency tree Reading state ...
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KDE converts my .webp , .GIF images to .PNG after copying in clipboard

Hi whenever I try to copy and paste .webp or .gif files in KDE to Freeoffice or libreoffice they get converted to .Png, Is this a clipboard problem? I'm using KDE 5.18.5 Kubuntu 19.10 Libreoffice ...
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PNG file does not appear in folder the first time I enter

I run a software that creates a PNG file in a folder. When the software has finished running I enter the specific folder where the PNG file is supposed to be created but it is not there. When I visit ...
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No files will open from Nautilus

Whenever I double-click a file in Nautilus it does not open. See below screenshots for .pdf and .png files. It does show the icon for document viewer for the .pdf file, but it still displays the ...
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1answer
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How do I print labels using a Brother QL700?

I can view .png files and printer but cannot find a print option in image viewer. My installed printers are not listed and I don't know where to go from here. What do I do?
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2answers
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What is simplest process to get ImageMagick 7 with PNG support on Ubuntu?

I've tried to find a simple explanation for several hours but I just can't seem to find anything useful. I'm primarily a Windows programmer with some experience with Linux-based OSes. For some reason ...
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2answers
356 views

xcf2png — XCF version 12 not supported [closed]

Gimp 2.10.8 Ubuntu 19.10 xcftools_1.0.7-6_amd64 I want to use commandline to convert Gimp xcf files to png.The output file rose.png is a fail. xcf2png rose.xcf -o rose.png Warning: XCF version 12 ...
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this file change its name every second :

tmp/systray_WXh70Y tmp/systray_k4M7n1 tmp/systray_sqBFYf one file in tmp folder change its name every second. it is valid file or not.
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1answer
4k views

convert all the png files in a folder to video

I have ~450 frames named 1...450. However, there are some missing frames for example frame 10, 30, and so on do not exists. I want to create an AVI video in the same order as 1...450.png. How should ...
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1answer
165 views

Command to convert many images to one square image (not becoming a column or a row)

Is this really duplicate? I have not yet found it anywhere. For example: I have 4 PNG images: image1.png, image2.png, image3.png, image4.png. Every one of them is 200x200 pixels. I want to convert ...
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1answer
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ICO or PNG Format?

Kind of a dumb question, but which file format are ubuntu icons (in apps and dash to dock) are they .png or .ico files? I want to create some icon/themes for ubuntu. But I'm not sure which format to ...
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1answer
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How can I overlay an image (a transparent PNG file) over all the “background” images in a directory using command line?

I have a transparent PNG file (a picture of a cow) I have a folder that contains images of grass, mountains, rivers and so on. I want to overlay the cow image onto those background images only by ...
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How to create animated PNG in Linux

I found that using PhotoShop anyone can create an animated PNG file in Windows. Is it possible in Linux too? Is there an application which can generate animated PNG files in Linux?
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1answer
535 views

Extracting embedded images from a PDF results in tiny stripes

I have an important pdf where I need to extract the source image, as lossless as possible (e.g. using png) For some reason, it seems that the source image is made out of 226 image stripes, and when I ...
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469 views

Is there a simple image processor that can reduce image color depth (convert 24-bit RGB to 2, 4 or 8-bit indexed color)?

I have a need for a quick/easy image processing application under Ubuntu 18.04 that will allow me to view, crop, scale down and reduce color depth/color mode (number of color bits per pixel) - with ...
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1answer
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How can I change the GRUB splash image in 18.04

NOTE: I am not after themes... more just hacking what's here as its faster. In Ubuntu 18.04 I am trying to change the grub.png/splash.png image, the one you see when GRUB asks you what system you ...
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1answer
5k views

How do I display an image in SSH terminal?

I want to access/view to a image on a remote Ubuntu server, to which I only have SSH access. Specifically, it is a black-and-white qr code .png image, and I want to scan it with my qr code scanner ...
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1answer
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Nautilus not showing thumbnails for PNG files

My Nautilus file-manager does not show a preview of PNG files. Ubuntu Version: Ubuntu 18.04.2 LTS Nautilus Version: GNOME nautilus 3.26.4 I have tried various "solutions" form the web like : sudo ...
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1answer
1k views

Removing the alpha channel from all the jpg images in a folder

How can I remove the alpha channel from jpg images automatically? I am using a deep learning code based on PyTorch that requires 3 channels but my images have 4 channels. I saw this answer but I do ...
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5answers
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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!
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1answer
106 views

How do I change “Image” tab information on a downloaded icon (PNG)?

I downloaded an icon, jester.png from FlatIcon.com. The website states that if you download without a paid membership, you must credit the author, which in this case is Freepik. In fact, here is what ...
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How to install PNGOUT on Ubuntu 18.04

I am following steps outlined in a document. The document was probably written for 16.04 or earlier release. When I execute the instruction with sudo command prepended, I get an error: cp: cannot ...
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1answer
109 views

Is there any drawback to using jpg instead of png for screenshots?

OS: Kubuntu 18.04 with gnome-screenshot installed. I ran these commands consecutively on the same desktop screen: gnome-screenshot -p -d 10 -f /home/dkb/"GS$(date +%Y%m%d%H%M%S)".png and gnome-...
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61 views

kile and png graphics

I am using kile as a latex editor with the latex compiler. With ubuntu 14.04 when I used \includegraphics to insert a png image I got the bounding box without doing nothing. I think that kile and ...
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1answer
6k views

How can I compress image PNG And JPG images? [duplicate]

How can I compress PNG and JPG images by more than 50%?
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5answers
13k views

How do I find out if a PNG is PNG-8 or PNG-24?

I have a PNG file but I can't tell if it's PNG-8 or PNG-24?
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3answers
5k views

What is the output of `cat image.png`?

What does the output mean when you do cat image.png? Is this what the image actually is made of? Does it matter what file extension the image has?
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3answers
5k views

What applications can be used for viewing .exr files?

I tried installing gwenview but doesn't seem to work for me. Can anyone recommend their favorite application for viewing .exr, .png files and sequences?
4
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1answer
234 views

Batch convert multiple screenshots in PNG to JPG

I have multiple screenshots in PNG format to print but cannot get them converted to JPG on my Galaxy S6 phone. How can I convert multiple PNG screenshots to JPG photos so I can print them on a photo ...
4
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1answer
5k views

What command should I use to rm all .png files in a folder and subfolder? [duplicate]

I started with this based off of another question I had: find -type f -iname '*.png' -exec rm that clearly didn't work, but am I atleast warm?
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1answer
231 views

Ubuntu 16.04 LTS Logo

Simple question - can someone running Ubuntu 16.04 LTS send me the file at /usr/share/unity-greeter/logo.png? I've tried to find it online with no success
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1answer
3k views

Conversion of png with alpha channel to jpg (without causing background artifacts)

How can I convert a png file using terminal or maybe a Python script to a jpg without artifacts? Here's an example of what I tried showing the artifacts I'm getting: jalal@klein:~$ convert cat.png ...
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1answer
7k views

Ubuntu pdftoppm converting pdf to png

In Ubuntu 16.04 LTS, I use pdftoppm to convert pdf files to png files one by one like the code given below: pdftoppm -rx 300 -ry 300 -png XYZ.pdf XYZ However, I have to convert many pdf files to png ...
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1answer
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How to check if libpng and png++ is installed

How do I check if png++ and libpng is installed in ubuntu ? I am trying to compile this code http://ttic.uchicago.edu/~dmcallester/SPS/index.html and the readme says I require libpng and png++ I have ...
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1answer
266 views

How to change png file parameter IHDR width using imageshack

I have a image with X*Y size say 42*42 and I want to change the X part to 384 fixed. I have a software which accepts only 384*Y size of images. I can change manually the X to 384 using paint: Open ...
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1answer
14k views

Fatal error reading PNG image file: Not a PNG file

I cannot open pictures with type PNG, and if i open a picture, it shows me this message (Fatal error reading PNG image file: Not a PNG file) How can i solve this problem please ?
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1answer
69 views

investigation of librsvg-dev

While testing the node-librsvg, which provides a node interface to convert svg to png images using librsvg-dev, I realized that it works really well on Ubuntu 12 , but some images can not be converted ...
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1answer
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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 ...
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1answer
45 views

Text scaling / clipboard issue

I am having some difficulty understanding some issues with dia, perhaps better posted as two questions, however I do get the impression that they are related in gnome somehow; they are as follows: ...
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1answer
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Can't install libpng-dev

I use Ubuntu 15.10 64-bit. When I run sudo apt-get install libpng-dev the console prints Reading package lists... Done Building dependency tree Reading state information... Done Note, ...
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1answer
4k views

create a video file from series of png images

I know there a lot of similar questions, but for some reason even after reading them it does not work. I would like to create a video from a series of png-files. The files are named like ...
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2answers
3k views

How to set default file type PNG for Simple Scan?

With Xubuntu 15.10, Simple Scan 3.18.1, the default file type is, even for images, PDF. I would like to set it to PNG, is that possible? There is a related, older question for changing from JPG to ...
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2answers
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how to convert .svg image to .png? [duplicate]

I would like to change the color of some SVG pictures and then save them as PNG images. I have installed GIMP. I am running Ubuntu 14.04. How can I do that?
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1answer
532 views

How can I get Eye of Gnome to open each figure in a new window?

I frequently open several (~10) figures that I want to compare. I have always generated them using an eps format then used evince to open the set I want to compare using something like evince set1*....
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1answer
6k views

Convert png to pdf without using convert

I'm trying to convert, from the command line, .png files of screenshots created by scrot to pdf files. I can successfully do this within shotwell, but I'd like to do it from the command line. ...