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Image resolution

Posted: Wed, 28th Jan 2009, 5:01pm

Post 1 of 10

papaquebec

Force: 400 | Joined: 15th Jan 2009 | Posts: 6

PhotoKey 2 User

Gold Member

When I import an image shot at 300dpi into PhotoKey 2 and choose "as foreground" for my canvas size ( about 24 x 36 cm ) why does Photokey reset the resolution to 96dpi?
This is very annoying and seriously degrades the quality of the images once reopened in photoshop for re-sizing!!
Posted: Thu, 29th Jan 2009, 9:47am

Post 2 of 10

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker Windows User

FXhome Team Member

When you set the canvas to 'as foreground' or 'as background', it uses the pixel dimensions of the foreground or background image. Changing the DPI will not affect these dimensions.

In other words, if your foreground image is 1000x1000 pixels in size (for example), it will remain that size regardless of the DPI setting. Your image will have the same size after exporting that it did before you brought it into PhotoKey, so there won't have been a quality drop.

DPI is used to translate the pixel size of an image into the print size, because a pixel has no direct correlation to real-world measurements. So the DPI setting lets the printer know how many pixels it should fit into a square inch on the page.

The DPI setting is more directly relevant if you choose one of the other canvas options. If you choose the '4 x 6 inch' option, for example, the program needs to combine that with the DPI setting in order to get the actual pixel dimensions of the canvas. So a '4 x 6 inch' canvas at 300dpi translates to a 1200 x 1800 image size.
Posted: Sat, 31st Jan 2009, 5:10pm

Post 3 of 10

papaquebec

Force: 400 | Joined: 15th Jan 2009 | Posts: 6

PhotoKey 2 User

Gold Member

I'm fully aware of that - but my original images are 36 x 24cm @300dpi, PhotoKey exports them (in TIFF) at 150 x 100 cm @72dpi, and in .jpg at slightly smaller physical dimensions @96dpi. Both these dpi settings are not suitable for high-quality output via my printing application!
I'd rather NOT have to use PSCS3 to have to resize and increase the dpi as some loss in quality is inevitable with every change in resolution and size!
Posted: Mon, 2nd Feb 2009, 9:15am

Post 4 of 10

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker Windows User

FXhome Team Member

What is the actual dimensions of the original images in pixels? Would it be possible for you to send one of your images to us at support@fxhome.com so we can take a look?
Posted: Mon, 2nd Feb 2009, 4:24pm

Post 5 of 10

papaquebec

Force: 400 | Joined: 15th Jan 2009 | Posts: 6

PhotoKey 2 User

Gold Member

I've mailed an image to you - unprocessed, and not intended for use with photokey as it's shot against a mottled background. It's just an average image shot with a Nikon D2Xs @300dpi
Posted: Tue, 3rd Feb 2009, 11:46am

Post 6 of 10

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker Windows User

FXhome Team Member

Thanks for sending the image. Just to confirm, it was the _PJQ0566.JPG image, is that correct?

The dimensions of the original image are 2848 x 4288.

After running this through PhotoKey 2 with the canvas set to 'as foreground', the exported image is still 2848 x 4288. This was the case whether exporting to TIFF, JPG or PNG.

The stored DPI was changed, which is something we'll look into. However, this does not affect the quality of the image at all, as the stored data is identical and the exported images have the same dimensions as the original.

DPI does not directly affect quality. All it is used for is translating the pixel size of an image into a measurement that a printer can recognise.

Hope this helps.
Posted: Wed, 4th Feb 2009, 4:02pm

Post 7 of 10

papaquebec

Force: 400 | Joined: 15th Jan 2009 | Posts: 6

PhotoKey 2 User

Gold Member

To directly quote from the Photokey 2 helpfile:

Canvas size....

....Resolution

These standard resolutions are displayed in dots-per-inch. Make sure you choose a resolution suitable for your printing requirements.

72dpi is suitable for on-screen viewing only.

For high quality printing, be sure to use a resolution of at least 300dpi.
Posted: Sun, 15th Feb 2009, 12:40pm

Post 8 of 10

papaquebec

Force: 400 | Joined: 15th Jan 2009 | Posts: 6

PhotoKey 2 User

Gold Member

Any comment on my last post Tarn?
Posted: Mon, 16th Feb 2009, 9:17am

Post 9 of 10

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker Windows User

FXhome Team Member

Er, what do you want me to comment on? You didn't really say anything other than quote the manual. smile
Posted: Mon, 16th Feb 2009, 9:23am

Post 10 of 10

papaquebec

Force: 400 | Joined: 15th Jan 2009 | Posts: 6

PhotoKey 2 User

Gold Member

I quoted the manual to bring this thread back to the point!

To quote the manual again:

"These standard resolutions are displayed in dots-per-inch. Make sure you choose a resolution suitable for your printing requirements.

72dpi is suitable for on-screen viewing only.

For high quality printing, be sure to use a resolution of at least 300dpi."

If 72dpi is suitable for "on-screen viewing only", why does the application output my files at 72dpi?