XnView Software

How to properly scale an image in xnview from 300 to 200 dpi?
The change DPI function only changed metadata.
The change picture size function does not take decimals in the percentage scale parameter. I need to specify 66.66666%. 67% is close, but differs to some degree.

Is there another way to do this properly?

The images I need to convert differs sligthly in size so a direct width/height setting is not sufficient either.

The image->set DPI setting DOES change the DPI of the image, it's just not apparent right away because of the fact that image viewers display images at their resolution, not their DPI. Xnview has recently added an option to view the image based on it's DPI however, this is located at view->real size. To see that the DPI of the image does indeed change, set it to a high DPI and click the real size option. Now set it to a low DPI and click the real size option again.


The only available options for resizing are percentage & dimensions. This means that you're only options are 67% or specifying a size. When batch resizing, you can simply set the size for one dimension, and it'll automatically set the other dimension for each image. Thus, if the proportions vary from one image to the next, you could have them all say 1200px in height, then let the width vary appropriately.

Drahken wrote:The image->set DPI setting DOES change the DPI of the image, it's just not apparent right away because of the fact that image viewers display images at their resolution, not their DPI. Xnview has recently added an option to view the image based on it's DPI however, this is located at view->real size. To see that the DPI of the image does indeed change, set it to a high DPI and click the real size option. Now set it to a low DPI and click the real size option again.


The only available options for resizing are percentage & dimensions. This means that you're only options are 67% or specifying a size. When batch resizing, you can simply set the size for one dimension, and it'll automatically set the other dimension for each image. Thus, if the proportions vary from one image to the next, you could have them all say 1200px in height, then let the width vary appropriately.

Hello, sorry this is simply not good enough for me. I need to scale all images proportionally, regardless of orginal resolution to 66.66666% size, and change DPI setting from 300 to 200. 67% is not close enough IMHO, besides xnview also cannot preserve an exact file tree hierachy in batch so there is two "flaws" that prevent me from doing what I need with this tool.

Otherwise XNView is really nice!

Drahken wrote: Wed Jun 13, 2007 3:54 pm The image->set DPI setting DOES change the DPI of the image

Just wanted to add here that this approach unfortunately recompresses the JPEG image and therefore is not lossles

David.P wrote: Sun Dec 08, 2019 2:26 pm

Drahken wrote: Wed Jun 13, 2007 3:54 pm The image->set DPI setting DOES change the DPI of the image

Just wanted to add here that this approach unfortunately recompresses the JPEG image and therefore is not lossles

Have you searched online?

The following link lossless change of dpi of a jpeg photo indicates that the DPI of a JPEG can, at least in some circumstances, be changed without recompressing the image.

The are other results that I haven't studied from my search "change dpi without recompressing'.

Yes, thanks. Have searched online ad nauseam...

With IrfanView and XnView (both Classic and MP), it didn't work at all. With Faststone Image Viewer and with ExiftoolGui, it (strangely) worked on some JPG images, but not on some others.