Selling dpchallenge prints, what file size?

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

01/11/2007 09:39:55 PM · #1

I have read the help page, but I am still having trouble understanding.

I just uploaded a second photo and I got this information.

# Print File Specs Width: 3038
# Height: 2019
# Size: 2.5mb
# Aspect: 1.50:1

I have green dots through the 10x15 size.
Being the 12x18 size is yellow dots I understand that the image is in a low, but acceptable DPI range.

The rest being in red is does not meet the minimum printable DPI of 150

So to get the DPI up to 150 or higher I just need to save it as a larger file?

The photo was 21.5mb until I compressed (?) it to a smaller file so it would upload faster.

I tried to upload the 21.5mb and it was taking forever even with my cable connection.

How can I see what my DPI is going to be as I am trying to decide how small to compress the file?

I am using paint shop pro XI to compress and save the file before uploading it.

4 x 6 Matte Print
4 x 6 Glossy Print
8 x 12 Glossy Print
8 x 12 Matte Print
10 x 15 Glossy Print
10 x 15 Matte Print
12 x 18 Glossy Print
12 x 18 Matte Print
16 x 24 Glossy Print (126 DPI)
16 x 24 Matte Print (126 DPI)
20 x 30 Glossy Print (101 DPI)
20 x 30 Matte Print (101 DPI)
24 x 36 Glossy Print (84 DPI)

Thanks...

Message edited by author 2007-01-11 21:40:37.

nicklevy

Canon EOS-350D Rebel XT

01/11/2007 09:51:44 PM · #2

# Print File Specs Width: 3038
# Height: 2019
# Size: 2.5mb
# Aspect: 1.50:1

...24 x 36 Glossy Print (84 DPI)...

3038/36= 84.39 DPI

2019/24= 84.125 DPI

If you want to have at least 150DPI for the largest size:

24*150= 3600

36*150= 5400

so your file size must be 3600px X 5400px

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

01/11/2007 09:56:05 PM · #3

Originally posted by nicklevy:

So the file size for the DPI is based on just the Width: 3038
# Height: 2019 ?

It has nothing to do with how I compress the file to upload it?

Looking at the Size: 2.5mb if I uploaded it so that was a 5.0mb file I would still have a printable photo that was Width: 3038
# Height: 2019 in. giving me the same DPI that I had before?

Message edited by author 2007-01-11 21:56:57.

nicklevy

Canon EOS-350D Rebel XT

01/11/2007 11:02:25 PM · #4

yes.

Compression has to do with overall quality.

DPI is only related to resolution.

The more resolution the bigger the print size BUT, if you print really big a heavilly compressed file you may find that the image quality is not that stunning.

The best for me seems to get the resoltuion you want based on the print size you want. Compress the least you can or even not at all and be patient while uploading. Anyway, if it's for DPCprints and it's too much compressed, your image will likely be rejected.

Message edited by author 2007-01-11 23:03:06.

SDW

Canon EOS-60D

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

01/11/2007 11:14:14 PM · #5

DPI
Why can't I just resize my image to the largest size?

01/11/2007 11:14:19 PM · #6

nicklevy

That clears it up, thanks so much for the replies.

I take it that when I am uploading for prints that it is using up my 50mb of space just like when I upload a image to my portfolio?

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

01/11/2007 11:17:03 PM · #7

Originally posted by Southern Gentleman:

DPI
Why can't I just resize my image to the largest size?

Yep, seen that.
The only way for me to get any bigger prints is to up my 6 meg pix camera to a higher one or do the above.

Not that I want to have bigger prints at this time, just wondering how it all works.

Message edited by author 2007-01-11 23:17:44.

SDW

Canon EOS-60D

01/11/2007 11:19:27 PM · #8

Originally posted by lakota:

nicklevy

That clears it up, thanks so much for the replies.

I take it that when I am uploading for prints that it is using up my 50mb of space just like when I upload a image to my portfolio?

To get larger prints with quality, it's all about DPI. The size in Mb really does not have that much to do with it. A .RAW file or .PSD file saved at 6 to 8 Mb looks just as good as a .Tiff at 40Mb or more.

SDW

Canon EOS-60D

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

01/11/2007 11:21:57 PM · #9

Originally posted by lakota:

Originally posted by Southern Gentleman:
DPI
Why can't I just resize my image to the largest size?

Yep, seen that.
The only way for me to get any bigger prints is to up my 6 meg pix camera to a higher one or do the above.

Not that I want to have bigger prints at this time, just wondering how it all works.

You can resize by resampling. Several photographers here know how to do it well using bicubic at a 5% step with each increase. But you will not be able to get an 84 DPI pic to a 150 DPI and make it look worth anything.

roba

Canon EOS-5D Mark II

Canon EF 70-200mm f/2.8L IS USM

01/12/2007 12:51:11 AM · #10

Check out this video tutorial by

konador:

(you might have to wait a while for the video to load)

It cleared up the process big time (for me anyway).

cpanaioti

Canon EOS-40D

Canon EF 70-300mm f/4.5-5.6 DO IS USM

01/12/2007 01:12:44 AM · #11

Originally posted by lakota:

I take it that when I am uploading for prints that it is using up my 50mb of space just like when I upload a image to my portfolio?

The large file you upload for a print does not count towards the 50mb, only the small image put in your portfolio counts towards that.

01/12/2007 08:36:42 AM · #12

Originally posted by roba:

Check out this video tutorial by konador:

(you might have to wait a while for the video to load)

It cleared up the process big time (for me anyway).

That was great, thanks for the link!