Imagemagick converted image is blurry

Question

I m using ImageMagick command line utility to convert images. I have a large size say (800x300 px) transparent tif image and I want it to convert it to cmyk tif, but the resulting image is blurry. how can I fix this?

What I have so far is

convert.exe sourcefilergb.tif 
-colorspace cmyk  -depth 8 -resize 122x44 -quality 100 
-density 300 -virtual-pixel transparent -background none 
-gravity center -extent 122x44 -compress none destinationcmyk.tif 

How to rectify my above code so that I could get desired result?

Thanks

Spancel

Try playing with the filter:blur option. – Turnout

@nwellnhof, well my problem is to get rid of blurry image – Spancel

If you use values smaller than 1.0 for filter:blur, the image will get sharper. – Turnout

ImageMagick may not resize well in CMYK. You would be best to resize while still sRGB, extend, then at the very end convert to CMYK. But converting to CMYK using profiles does a better job of color quality that just using -colorspace CMYK. Can you post a link to your TIF file. I can then test things. – For

Answer 1

This is probably an aliasing issue. Try -adaptive-resize instead of -resize, as explained in the docs. You might also try different resolution and density settings depending on your input.

Hyoscyamus

Answer 2

However, many filters (even the default filters) can blur images slightly.

...

When enlarging or magnifying an image ["-sample] only performs does [sic] pixel replication... However when shrinking an image "-sample" simply deletes rows and columns of pixels.

http://www.imagemagick.org/Usage/resize/

Heteronomy