How to define the input image format for imagemagick convert, if convert -identify can't identify the input format by content, but I know it format well, and I can define it directly?
For example, I want to convert the svg file to png, but I have an example of valid svg which can't be identified by content.
Step to reproduce
Take this valid https://commons.wikimedia.org/wiki/File:Svg.svg
Rename file Svg.svg to image
Try to convert image image.png
Got the
convert.exe: NoDecodeDelegateForThisImageFormat ' # error/constitute.cReadImage/501.
ImageMagick version is 6.9.2-0 Q16 x86 2015-08-15
Like this - you need to tell ImageMagick what to expect with the svg: prefix as it can't work out what is coming from the extension since there isn't one:
curl https://upload.wikimedia.org/wikipedia/commons/1/15/Svg.svg > image
convert svg:image image.png
Related
I want to decode and understand the structure of various latest image formats (namely WebP, JPEG XL, HEIF and AVIF) and compare header information with respect to image data to see which format is header information heavy with respect to image data. I was wondering how I can do this using Python.
Is there a simple way to decode various image file formats of the same image in either HEX or Binary and learn how much of the file contents is the image data and how much else is the header information? Better yet, is there a way to learn the breakdown of header information for various file formats??
So far I got to a point where I got a file to open in binary mode (Below is the sample code I have for the AVIF test image) but I'm not sure how I can decrypt, read and understand the structure. Googling around, I found some information for JPEG format (like the information shown on this page for JPEG https://yasoob.me/posts/understanding-and-writing-jpeg-decoder-in-python/) but none for WebP, HEIF, and AVIF on how I can read the binary format.
image = 'test.avif'
with open(image, 'rb') as image_file:
content = image_file.read()
Content
I wish to know how exactly can we extract the header information from the images while compression.
I want to convert a piece of SVG to MVG. Could I do something similar to this convert msvg:pram.svg pram.mvg using RMagick methods? I don't want to save the output in a file, but I want to have it in a variable in Ruby.
In general, converting an image in one format to another format is as simple as making a copy of the image using a different suffix. https://rmagick.github.io/comtasks.html#convert
Use the to_blob method to get an image as a Ruby string:
https://rmagick.github.io/comtasks.html#blob
I'm trying to convert a YUV422 image (YUV422_8_UYVY, unsigned ,unpacked, 16bpp) in to jpeg using ffmpeg's ,this is Code which I am following
Image size: 2448x2050
Original YUV Image: not able to upload as the format is YUV
(Original Image Decodec by ffmpeg command prompt)
Image:This is original Image
Image size: 2448x2050
reconstruct Image:Reconstruct Image through above Code
so the reconstruct image is not as the original image
my format is UYVY whereas supported format is AV_PIX_FMT_YUVJ420P
so what should be the correct format for UYVY input image...?
pCodecCtx->pix_fmt=AV_PIX_FMT_?????
if i use pCodecCtx->pix_fmt=AV_PIX_FMT_UYVY422;
i got an arrer saying
[mjpeg # 00c0b2a0] specified pixel format uyvy422 is invalid or not supported
You say the image format is "unpacked" (??), but at the same time you call it YUV422_8_UYVY, which suggests it's packed (i.e. not planar). The output you're getting suggests that it's packed.
FFmpeg's image encoders, in general, do not support packed input. You first need to make it planar. You have two options:
convert it to planar YUV-4:2:2 (AV_PIX_FMT_YUVJ422P) and input that into the encoder;
convert it to planar YUV-4:2:0 (AV_PIX_FMT_YUVJ420P) and input that into the encoder.
The first will preserve chroma subsampling (better quality), but the second will have better downstream support (in other applications, to decode the image). To convert the image, you use libswscale. The output image from that conversion can be input into the FFmpeg encoder.
I'm currently looking for a way to generate the thumbnail image for a given pdf file, which shows several pages in the same image. The output should like what shows in the arxiv sanity website. I want to know if there is any npm package which supports this functionality. Thanks.
In ImageMagick command line, you can do that as follows. Suppose you want 8 pages from the PDF.
Input PDF from http://www.arxiv-sanity.com:
convert image.pdf[0-7] -thumbnail 140x140 -background white +smush 20 -bordercolor white -border 10 result.jpg
This takes the first 8 pages, makes thumbnails of size 140x140 and appends them side-by-side with a 20 pixels white spacing between them and adds a 10 pixel white border around it all.
Sorry, I do not know Node.js. But apparently there is a module that integrates ImageMagick. See https://github.com/yourdeveloper/node-imagemagick
var PDFImage = require("pdf-image").PDFImage; //pdf to image convert
var pdfImage = new PDFImage("1120.pdf");
pdfImage.convertPage(0).then(function (imagePath) {
},(err)=>{
console.log("err",err)
})
//##jimp Npm use thumbnail image generate
//if auth error Follow this step :
-> In /etc/ImageMagick-6/policy.xml (or /etc/ImageMagick/policy.xml) find the following line
->
and change it to allow reading and writing by the PDF coder in ImageMagick:
I would like to convert a jpg image to a pdf file using ImageMagick convert. I can successfully do so using the following:
convert image.jpg image.pdf
How could I convert the image if the original file name was "image" and not "image.jpg", and the target file name is "image" and not "image.pdf"?
You can use Explicit Image Format to force convert to use a specific format, regardless of filename.
convert jpg:image_source pdf:image_out