10D CRW to large prints...how?

[eliteportraits]

Hi folks,
I have a set of 10d RAW files that I need to convert to 16x20 prints. I do not have (and can't get genuine fractals) but I do have photoshop 7. My end use is for the prints to be art prints (BW) and the viewing distance will be anywhere from a few feet on out. The output will be lightjet 5000.
When I translate the CRW to TIFF I come up with an 11.33xwhatever file at 180 dpi. For the light jet I'd like 16x20 at 300 dpi. I tried to do the upsampeling with the conventional method of doing 110% increases and get very pixelated results. I'm wondering if someone can give me a step by step suggestion on how to better do this. Any ideas?

Thanks!
Mark

[PaulB]

I trust you meant resampling in 10% increments - not 110%!

Drop the resample to 5% increments and see how that works - however nothing is for free and some deterioration is inevitable.

On Genuine Fractals - you can download a trial, might just enable you to do the job before the usage locks you out. It is quite stunning how GF Print Pro can upsize without (too much) quality loss.

[JoeMA]

[quote]eliteportraits wrote:
Hi folks,
I have a set of 10d RAW files that I need to convert to 16x20 prints. I do not have (and can't get genuine fractals) but I do have photoshop 7. My end use is for the prints to be art prints (BW) and the viewing distance will be anywhere from a few feet on out. The output will be lightjet 5000.
When I translate the CRW to TIFF I come up with an 11.33xwhatever file at 180 dpi. For the light jet I'd like 16x20 at 300 dpi. I tried to do the upsampeling with the conventional method of doing 110% increases and get very pixelated results. I'm wondering if someone can give me a step by step suggestion on how to better do this. Any ideas?

[quote]

What is probably happening is that you are continuing to lower the dpi as you resample/interpolate probably getting down to someting under 100dpi which will print with pixelization.

First, go to 'Image Size" and UNCHECK resambling and then change the ppi to 300 from its present 180 - that will automatically change the size of the print smaller - Click OK. Then go back to 'Image Size" and CHECK resampling. Then use 110 to 120% increments to reach your desired size. (Make sure you are using "bicubic' interpolation)

Note; the 10D has a 1:1.5 aspect ratio and 16x20 is 1:1.25 so if you really want that size you will need to crop some to get it- do it this way: when you get close to 16x20 by incremental/bicubic interpolation. Then use the crop tool and enter 16x20 and 300dpi in the tool bar options and do the final sizing/cropping.

To avoid cropping: use a 1: 1.5 aspect ratio like 16x24.

Hope that helps.

Regards,
JoeMA

[Longwatcher]

I upsized two images a couple of nights ago with different results.

In PS7 with the first print I first just scaled (using photo size) it to 16x24 at 300dpi - very pixelated. Then I started over and first
set the dpi to 300 (using photo size) and then I scaled it up incrementally about 10% at a time. Much better results, but still not as good it seemed as the untouched version. It was however at an acceptable quality level.

With the second print I cropped it to 16x20 at 300 DPI using the fill-in boxes at the top of the PS7 screen when in cropping mode. As an initial check. It took way longer for the computer to process it, but it seemed to be at the same quality level as the original when done.

I did not have time to go back and redo the first image so, I finished off both with USM, saved in .tif, wrote to CD-R and they are now at the local camera store being printed to 16x20 and 16x24 as appropriate.

So therefore, I suggest trying just crop it to what you want in PS7 (if you have it) first and then compare the results with other methods. It could have just been the difference in the orginals themselves though. The first was trees in a park, the second was a duck (or three) on a pylon.

Just my experience, more to follow when I see the results from my first attempt.