Upsizing image ... help - DPChallenge Forums

12/30/2014 06:50:52 PM · #1

The image I need to upsize is my very first ribbon on DPC

It was shot as RAW on a Canon 40d image size is 1936 Ã� 1288 - file size is 5.9 mb as a raw
When I edit it in lightroom and export as a jpg at 300dpi it is only 2.2 mb and size is now 3817 x 2487
If I upload this to a canvas print program it advises print is too lower quality (will be printing to canvas)

So, I exported the JPG from lightroom by saying that the longest side of the print was 24 inches
New file size is 13.7 mb and it now works in the program

I just want to know if this will print OK by having upsized it like this?
Should I use the RAW image to do the upsizing and export out of Lightroom ... will this be a better file than upsizing the jPG?
Is there a better way than doing it this way?
Should I lower the dpi to 250 or even 200 for the canvas, would this help keep the image a better quality for the print?

I also need to print this at 30x40 inches.
Can I do it the same way?
Will this be too big for the file?

Thanks for your help.

Message edited by author 2014-12-30 18:51:28.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

12/30/2014 07:00:37 PM · #2

If you upsize the JPEG and re-save as another JPEG you could suffer quality loss due to repeated compression, not just upsizing, depending on the JPEG settings and the programs implementation of the algorithm.

I always edit save in either Photoshop or TIFF formats until the very final step of saving the ultimate image as a JPEG.

"File size" with regard to JPEG files is somewhat irrelevant, as images with exactly the same number of pixels can be wildly different sizes when saved to disk depending on the level of detail/complexity in the image.

Try saving a copy of some arbitrary image as a JPEG, then run the Noise filter once or twice and save it again as a new file and compare the file sizes on your disk.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

12/30/2014 07:03:16 PM · #3

According to DPC Prints standards (and most places which print on canvas) you can get an acceptable print at 150dpi, so a 30-inch print should be at least 4500 pixels.

soup

Canon EOS-30D

Canon EF 17-40mm f/4.0L USM

12/30/2014 07:16:52 PM · #4

GeneralE is right.

export the original out of lightroom as TIFF into PS.

i wouldn't do any resizing w/in lightroom.

up sample the image in PS in increments of about 10% each step. until you start to see a loss in quality on screen at 100%. then back off a step or two.

you want to set the document size, not the pixel size. set the DPI to 150, check constrain proportions, and check resample image.

then you can fine tune the enlarged version for the actual print file.

then convert the color space to sRGB, then save as the final JPEG.

i think i got it right :)

make sense ?

Neil

Fujifilm X-T30

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

12/30/2014 07:25:28 PM · #5

Do you have the cc version of ps? It has a new algorithm for image size that works very well for enlargement.

https://www.youtube.com/watch?v=S29pVImGNJE

Or grab the trial of perfect resize:

//www.ononesoftware.com/products/resize9/

Or send me a copy and I'll upsize it in Perfect Resize for you (uses Fractals to interpolate).

For fun, I just resized your DPC entry in PS CC using the new image size dialog -- at 640 wide, to 4500 x 3410 (30" at 150 dpi) and it's actually looks pretty good viewed on my 30" monitor at 50% (what my printer told me to use for proofing). Well, not pro quality, but that was a pretty extreme test.

Message edited by author 2014-12-30 19:32:23.

Canon RF 100-500mm f/4.5-7.1 L IS USM

12/30/2014 11:53:29 PM · #6

Sent the file to Neil for him to work his magic.

Thanks heaps Neil. :)

JakeKurdsjuk

Canon EOS R5

12/31/2014 09:06:00 AM · #7

I've used a bunch of different methods, but learned a while ago from my brother that Adobe Camera RAW does as good, if not a better job, at upsizing than anything. I've used it to take a cropped portion of a 24MP RAW file and output a working 36MP PSD file with limited degradation. I do this using the LR Export function as shown here...

The one thing I don't show is the option in the Export Location dialogue that adds it to my LR Catalog automatically. You can obviously play with MP's or change the dropdown from "Megapixels" to "Width & Height" or "Dimensions" and upsize that way. I've gone side by side with Perfect Resize 8 and actually prefer what I get from ACR/LR most of the time. And heck, it's already there if you have Lightroom and/or Photoshop.

Canon RF 100-500mm f/4.5-7.1 L IS USM

12/31/2014 05:54:36 PM · #8

Hi Jake

That's sort of what I did initially with my image through Lightroom.
I exported at 24 inches for the long side and 200dpi (understand this is enough for canvas)
The program accepts the new file but as I had no idea of the quality once printed I came here to check it would be OK

Neil has been kind enough to upsize my photo for me but when I compare them to the lightroom one I generated they seem very soft.

Hmmmmm

JakeKurdsjuk

Canon EOS R5

12/31/2014 06:25:24 PM · #9

Originally posted by RamblinR:

Neil's are soft or the LR image?

You could always grab an 8x10" section and print to a photo printer to check for sharpness. Canvas paper will have an impact, but you'll at least have an idea

Message edited by author 2014-12-31 18:27:21.

soup

Canon EOS-30D

Canon EF 17-40mm f/4.0L USM

12/31/2014 08:18:12 PM · #10

what version of lightroom are you using backdoorhippie ?

soup

Canon EOS-30D

Canon EF 17-40mm f/4.0L USM

12/31/2014 08:19:40 PM · #11

could always post a chunk of the image here as well. a crop from the 100%

chalice

Canon EOS-5D Mark III

Canon EF 100mm f/2.8L Macro IS USM

12/31/2014 08:56:55 PM · #12

This past week, for the first time, I used OnOne Software's Resize module in the recently released Suite 9 and was very impressed with the results. I was able to resize a photo to 60" X 40" (looking at it on my monitor) with no apparent degradation. I haven't bothered to print anything at that size, though, because I haven't had the need for such a large print so far. My original file size was 5760 pixels X 3840 pixels at 300 ppi, which equates to 19.2" X 12.8". This equates to about a 500% increase in size. I was surprised at the results.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

12/31/2014 09:00:35 PM · #13

Uh, make that a 300% increase ... still impressive!

Neil

Fujifilm X-T30

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

01/01/2015 01:04:50 AM · #14

They will look soft at 100%. It doesn't matter...since they will actually be reduced to print. They are 300 dpi, and you can apply additional sharpening before printing.

They were done with On One Perfect Resize v8. I don't have v9, the latest. I could have sharpened them more, but you can also do that in PS.

I also upsampled in PS CC...there were more artifacts than in Perfect Resize, which is why I chose that. I would not use LR to do upsampling. PS or On One.

As I mentioned, IMHO you should not actually have to resize to print as long as your original is 120 dpi or better at the new size. I think yours fits that bill, but I didn't do the math. But resizing won't hurt, because once you enlarge, what they will print will actually be reduced.

I recently printed a batch to standout Lustre prints and used on-one to upsample. They looked pretty bad at 100%, but they came out great at 20x30 on lustre paper (mounted, as a standout). WHCC told me to proof them at 50%. The only real advantage of upsampling is that you can sharpen and handle defects. Otherwise, their printing process upsamples.

And canvas is much more forgiving of softness than prints are. I've printed over 50 16x24 canvases from various sized originals without doing any resampling (at CanvasOnDemand). I've never had one look too soft.

Message edited by author 2015-01-01 01:11:59.

Canon RF 100-500mm f/4.5-7.1 L IS USM

01/01/2015 03:49:54 AM · #15

I'm new to upsizing, never had to do it before and was surprised that 40d RAW file adjusted and put out to JPG would not give a good enough file.

I recently printed to canvas from my Olympus EM1 (same printing company).
I cropped it to a little large than 50% of the original image and it printed to a 750 x 1000mm canvas without a problem and is amazing.
So, I expected the old RAW file would have no problem.

Thanks Neil for your help. Will get this sorted.

Message edited by author 2015-01-01 15:31:55.

JakeKurdsjuk

Canon EOS R5

01/01/2015 07:35:49 AM · #16

Originally posted by soup:

what version of lightroom are you using backdoorhippie ?

I have the CC package so it's the latest and greatest. Running it on a MacBook Pro.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/01/2015 12:52:37 PM · #17

Originally posted by RamblinR:

... printed to a 750 x 1000cm canvas without a problem and is amazing.

You printed a 30-foot long canvas?