| Author | Thread |
|
|
11/19/2006 08:48:19 PM · #1 |
I will be showing some prints in a gallery soon (my first time) and i am unfamiliar with certain aspects of large scale printing. i will be using EZ Prints and buying frames from american frame.
I shoot with a canon 5d giving me 4368 x 2912 pixels in my RAW files. i shot these images with my sigma 150 macro (very sharp lens when in focus, and buttery smooth bokeh). and by and large there is no noise in the photos (either shot at ISO 100 or ran through noise ninja)
so for 20 x 30 in prints, should i send the files in at 150 dpi?
i could upsample the files in any number of ways:
-change the pixel dimensions in the photoshop RAW processing window
-upsample using bicubic smoother (possibly in 5-10% increments)
-use genuine fractals (a friend has it so price is no concern)
i am also unsure what the native dpi of EZ Prints is (i.e. if i upload at 150 dpi, will they interpolate it themselves to print at 240 or 300 or whatever they use? and if so should i just let them handle it?
thanks for any help or experience you might have.
Russ |
|
|
|
11/19/2006 09:00:09 PM · #2 |
if they print at 300dpi, the information sent to the paper is at 300dpi and thus must be converted to this resolution at some point. you can convert it yourself or have them convert it. if you convert it, you can control the process, and if desired use more complex algorithms which may require a lot of processing time and decide for yourself if you approve. if they do it, their machines will do it on the fly.
if someone has hundreds of images where they are willing to accept 90% of the maximum upsampling potential in exchange for not having to manually tweak every one, then do that. for a situation where you are dealing with individual images, you may find it more worthwhile to take control.
similar to color correction... it's easier to let them do it, but wouldn't you rather be in control? depending upon time and cost considerations, you could do a test where you do one conversion and let them do the other... depending upon how far away people will be examining the final prints from, the difference may be imperceptable.
one thing to keep in mind... if you plan on making more prints in the future, if you upsample it yourself, you can create identical images in the future from that master, while you wouldn't be guaranteed similar results with the on-the-fly conversion (again... the difference may not be significant to you).
sorry if this is a little confusing, feel free to email me if you have further questions... (not that i'm claiming to be the main expert... much of my background and interest in changing pixel sizes and determining whether it makes a difference in the appearance comes from medical imaging, which is my day job) |
|
|
|
11/19/2006 09:53:05 PM · #3 |
Use 150dpi for ezprints at that size.
|
|
|
|
11/19/2006 11:48:44 PM · #4 |
| so do you think that they will actually print the file at 150 dpi? or that their method of interpolation for getting the file up the printer's native dpi (300 i believe) is better than any method i can do myself? |
|
|
|
11/19/2006 11:54:49 PM · #5 |
|
|
|
11/19/2006 11:58:57 PM · #6 |
I haven't used ezprints but in my experience it is always better to upsize on your own - my lab was giving me unsatisfactory results when I was letting them to the resizing - and they want 360dpi which is a bit of an ask from a D70.
|
|
|
|
11/20/2006 12:41:04 AM · #7 |
| One thing to consider with large prints is viewing distance. Most people aren't going to view a 20x30 as close as they would an 8x10, they usually stand back a bit to take it all in so it should go unnoticable at that distance. Either way you should be fine. |
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 09/01/2025 01:16:24 AM EDT.
