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Questions tagged [png]

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

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2 answers
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How to print an image to PDF from the graphical interface?

Right now I'm using GThumb to print images to PDF but am looking for a short-cut. Certainly there are console based utilities to convert files to PDF but I'm looking to do that from the graphical ...
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0 votes
0 answers
11 views

Apply Text to Multiple Layers, and then Export With each Layer as Individual PNG

I'm new here. Thanks for the warm community. I know about the "Export Layers As..." plug in. It has saved me many countless hours. However I'm wondering about something else in that arena. I ...
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0 votes
0 answers
47 views

Convert img to pdf [duplicate]

convert *.png out.pdf This command gives me error message saying "attempt to perform an operation not allowed by security policy"
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4 votes
5 answers
1k views

How to convert webp to grayscale png?

I have a bunch of webp images and need to convert them to png format. I know png supports different color modes like grayscale which I need. Is there any Linux tool or online services to achieve this ...
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1 answer
660 views

What is the quickest way to convert a GeoTIFF file to PNG and crop the output?

I need to automate for a project converting tons of GeoTIFF files to PNG and being able to resize them in 4 equally sized squares. What would be a program I could use for this?
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1 vote
2 answers
546 views

How to convert 32MB of PNG file to 200Kbs without losing its colors

I have couple of images that are of 32MBs of size and I want to change their size from 32MBs to 100Kbs or any KBs of size without affecting its colours. The commands I am trying are: muhammad@muhammad-...
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1 vote
0 answers
41 views

where to find an example png file which has date and time metadata that eye-of-gnome (eog) shows

I'm using xubuntu 20.04 and have installed the eye-of-gnome (eog) on it. The version of eog is GNOME Image Viewer 3.36.3 On the right side of the eog window (which is called "Image Viewer") ...
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1 answer
31 views

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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0 answers
74 views

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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0 votes
1 answer
1k 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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0 answers
306 views

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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0 answers
175 views

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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0 votes
0 answers
110 views

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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0 answers
44 views

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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2 votes
0 answers
92 views

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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0 votes
1 answer
323 views

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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4 votes
3 answers
3k views

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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4 votes
2 answers
527 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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0 answers
24 views

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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2 votes
1 answer
8k 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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2 votes
1 answer
355 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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6 votes
1 answer
4k views

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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3 votes
1 answer
4k views

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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2 votes
0 answers
2k views

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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-1 votes
1 answer
1k 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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3 votes
0 answers
671 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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1 vote
1 answer
8k views

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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1 vote
1 answer
7k 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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3 votes
1 answer
2k views

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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2 votes
1 answer
2k 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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257 votes
5 answers
94k views

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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4 votes
1 answer
120 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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2 votes
0 answers
2k views

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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  • 539
0 votes
1 answer
111 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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1 vote
0 answers
70 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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5 votes
1 answer
8k 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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15 votes
5 answers
15k 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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  • 505
4 votes
3 answers
6k 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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8 votes
3 answers
7k 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?
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4 votes
1 answer
393 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 ...
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4 votes
1 answer
7k 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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0 votes
1 answer
254 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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  • 1,013
4 votes
1 answer
4k 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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  • 3,661
4 votes
1 answer
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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1 vote
1 answer
4k views

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 and the readme says libpng and png++ are required: SPS-Stereo: Slanted Plane Smoothing Stereo SPS-Stereo is ...
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  • 1,072
2 votes
1 answer
398 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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2 votes
1 answer
17k 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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1 vote
1 answer
84 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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13 votes
2 answers
19k views

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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  • 333
0 votes
1 answer
50 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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