imagemagick-convert

I'm trying to get images resized to a given width , with the height being adjusted proportionally - no matter if the image has landscape or portrait orientation. I have two images I test the ImageMagick convert -resize command with and from what I have read, I would expect the following to work for any kind of image: convert source.jpg -resize 200 out.jpg The problem is, it doesn't. Here are my results: Source Image 1: landscape , 3264 × 2448 , resizes to 200 × 150 ==> WORKS Source Image 2: portrait , 3240 × 4320 , resizes to 150 × 200 ==> FAIL Now, I know I could fix this by reading in the

I have 100 PNG-files and each of them is 8250x4090 big. I need to append them with Imagemagick to one big PNG-file (82500 x 40900) so that I have 10 rows and 10 columns . I know how the code must look like but I get the errors: convert.exe: unable to extend cache `C:\Row_345.png': No space left on device @ error/cache.c/OpenPixelCache/3689. convert.exe: Memory allocation failed `C:\Row_345.png' @ error/png.c/WriteOnePNGImage/8725. First question: How much space is needed (approximately)? I have 8 GB of Ram and 30 GB free SSD and it wasn't enough. The pictures have polygons and lines in up to 5

I am trying to convert svg image to eps using Imagemagick. I am able to convert the image using Imagemagick, but the image size is too high when compared to the original image size and the content is not displayed correctly compared to the svg. I was just wondering this too. However, it appears that Imagemagick might not be the best tool to do this. Imagemagick is a "raster image processor," but SVG and EPS are vector formats. So using Imagemagick will cause those images to lose information as it has to convert from a vector format, to a raster format, and then back to vector. This probably

I have been using ImageMagick command line tool for jpeg compression of the images. However, I'm trying to understand the role of sampling factor. It says the sampling factor is used to specify the block size i.e. 8x8 or 16x16. However, I can't find the default values used if I omit this parameter. Also, I tried fetching properties of an image by using the following command: identify -verbose image.jpg It shows sampling factor values as 1x1, 1x1, 1x1. What does it mean? Either it should be 8x8 or 16x16 or 32x32.... Could anyone please give me an idea where to find these details? Iamiuru From

I am trying to use the "convert" command-line tool from ImageMagick. I have a base64 encoded png file and I need to convert it to another format. I am looking at documentation and a forum discussion which suggests that I should be able to use this syntax: convert inline:file.txt file.jpg But when I do this, I get this error message: convert: corrupt image `file.txt' @ error/constitute.c/ReadInlineImage/910. What am I doing wrong? How do I get convert to read a base64 image file? Mark Setchell Updated Answer - now that I understand it better myself :-) Basically, you can base64 encode an image

I am trying to convert an entire folder to grayscale, using image magick. convert *.jpg -colorspace Gray -separate -average is met with this error : convert: `-average' @ error/convert.c/ConvertImageCommand/3290. What is the correct command for this? If you have lots of files to process, use mogrify : magick mogrify -colorspace gray *.jpg If you have tens of thousands of images and a multi-core CPU, you can get them all done in parallel with GNU Parallel : parallel -X magick mogrify -colorspace gray ::: *.jpg 来源： https://stackoverflow.com/questions/53262968/convert-entire-folder-to-greyscale

I have 4 (x,y) coordinates between which I want place image as example given below. The whole image must be placed within this area without cropping. Using this 800x600 balloon: You can use a "Perspective Distort" like this: convert balloon.jpg -matte -virtual-pixel transparent \ -distort Perspective '0,0,50,0 0,599,100,599 800,0,750,100 800,600,500,500' result.png There are basically 4 pairs of points in the parameters,i.e. Pt1X,Pt1Y,Pt1NewX,Pt1NewY Pt2X,Pt2Y,Pt2NewX,Pt2NewY Pt3X,Pt3Y,Pt3NewX,Pt3NewY Pt4X,Pt4Y,Pt4NewX,Pt4NewY So the command above moves point 0,0 to 50,0 and moves point 0,599

I'm using dragonfly ~> 0.9.15 Given an image, I'm confused at how to use the convert method in dragonfly to crop a circular portion from the image with transparent background. I am able to use a direct image magick command to run it from command line but the example command I found uses actual files and I'm unaware of how to get the file while dragonfly processes it on the fly. Here's the actual command I took from a stack overflow question with imagemagick. https://stackoverflow.com/a/999563/1664852 convert -size 200x200 xc:none -fill walter.jpg -draw "circle 100,100 100,1" circle_thumb.png