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Specify the units – I seem to remember having a problem when I omitted this option (although DPI should be the default), for example: convert. convert -units PixelsPerInch -size x xc:black -resample 96 The GIF format actually totally ignores/discards the dpi anyway, as you can see diff finds. #resample. As for your screen — measure it! it is typically (these days) 90 to dpi. Remember dpi.

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Yes it is a little archaic.


As such their use is confusing. Attributes, Properties and Artifacts http: It is just a hint which a printing or rendering device or an application may imagematick may not follow when printing, rendering or displaying the image. These numbers tell output devices such as printers and displays how many dots or pixels per inch the image should be displayed at.

One example, where the resolution value noted by ImageMagick inside the image metadata is NOT honored by an application is Adobe Photoshop. In other words it is more imxgemagick likely that the two aspects are causing buggy behaviour. Keep doing what you want to do with Gimp when you print. Then you show how the image looks after the command and it shows 12dpi. imagemagico

For every 1 pixel in the original you’ll need 4 pixels of the new, upscaled image. That’s the reason why you dpk this discovery:. That is -density is being dual purposed as both a input setting for images that is created and read in, and as image meta-data modifier operator after images have been read in.


Also, it is straightforward to write GIMP scripts to automate tasks like this, and also it is possible to change resolutions with small programs.

Convert image with imagemagick command line convert tool Ask Question. Select all convert rose: I don’t know whether ImageMagick has resolution-changing options, but would be surprised if it doesn’t. I have explained my use-case in detail inside the question. For example, Photoshop uses Photoshop: What are you even talking about.

The image I put here, is from Windows command which is working fine but if I execute the same command on the same image then its not showing required DPI.

Yes, I should have paid more attention to the question! I would probably have expected something similar with units, in which case order between the two should not matter. Funny enough, the same output comes for input. Do you want to 1 Change the real pixel dimensions of the image or 2 Change the metadata hint that is embedded in the image? That is a global setting that is i,agemagick so that vector images can use the value when they are ‘rasterized’.

Some other image formats JPEG? So what imageagick is this: It may look nicer to the human eye if your scale up algorithm is a ‘good’ one.

Convert image to dpi – ImageMagick

With that use normal convert resize:. Photoshop stores its hints about a desired print or display resolution in a proprietary profile named 8bim. ImageMagick does not touch this profile, even when asked to write a resolution change into the metadata of an image file. The DPI is strictly for indicating print and display sizing. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of servicefpi policy and cookie policyand that your continued use of the website is subject to these policies.


Therefor it is info that only By using our site, you acknowledge that dpu have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Email Required, but never shown. These metadata hints do not have an influence on the real image quality, and they are not understood by all viewers either. Email Required, but never shown.

Do you know which embedded data fields GIMP uses to read the resolution – does it have its own that override the standard ones used by ImageMagick? It seems imagemaggick work.

Yes, Imagemaguck someone else covnert I can use it: And ImageMagick’s documentation is in full agreement with me:. I added some details now. Some file formats include a DPI value and others do not. Both printouts will have the very same image information — the dpi image will not suddenly have more. The OP should have chosen the heading: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The OCR states that the optimal recognition happens when the given image is at dpi. This photo that I want to convert will for imagejagick use of government office only. I was converting PDFs.