Pixellation
Aug 5, 2019 15:21:08 #
Technohogs,
I took a photo at night of the southern tip of manhattan. When I checked its size in Elements it indicated a 42.2 M image at a resolution of 72P/I, pixel dimensions of 4953 x 2980 at 68.8 x 41.4 inches. I emailed this image to a photo studio in NYC and stated that I would like to have it enlarged to 22.6" x 13.8." My gmail program indicated it was only 14,080 K. The photo studio told me that it was too pixellated to enlarge beyond to 22" wide and would be better at 12".
Where and why was this image so pixellated with all the information it appeared to contain and is there anything I can do about it?
Thanks,
Photodoc
I took a photo at night of the southern tip of manhattan. When I checked its size in Elements it indicated a 42.2 M image at a resolution of 72P/I, pixel dimensions of 4953 x 2980 at 68.8 x 41.4 inches. I emailed this image to a photo studio in NYC and stated that I would like to have it enlarged to 22.6" x 13.8." My gmail program indicated it was only 14,080 K. The photo studio told me that it was too pixellated to enlarge beyond to 22" wide and would be better at 12".
Where and why was this image so pixellated with all the information it appeared to contain and is there anything I can do about it?
Thanks,
Photodoc
Aug 5, 2019 15:33:21 #
Most email clients limit the total size of the email to 20Meg.
There's a good chance what you sent may have been reduced.
Better to upload the file to something like One Drive and give the lab access to the file if you want them to have the original.
I know if I send images via my phone, it sometimes asks if I want to reduce the file or send the original, which is under 20Meg.
There's a good chance what you sent may have been reduced.
Better to upload the file to something like One Drive and give the lab access to the file if you want them to have the original.
I know if I send images via my phone, it sometimes asks if I want to reduce the file or send the original, which is under 20Meg.
Aug 5, 2019 15:58:14 #
photodoc16 wrote:
Technohogs, br I took a photo at night of the sout... (show quote)
Yes, as described by another UHH'er your file would most likely be reduced from 42.2MB to less than 20MB. But also why are you working with a 72ppi image? When I process my 24MP RAW image files via ACR I get 16-bit, 300ppi, sRGB files that are just over 20x33". That would be a bit over 4000x6016 pixels.
Aug 5, 2019 16:16:20 #
Aug 5, 2019 16:23:35 #
Did you mail a JPEG? Was the save quality set at 100% (highest?)
FYI - 42Mp does not equal 42Mb. See BebuLamar's comment.
FYI - 42Mp does not equal 42Mb. See BebuLamar's comment.
Aug 5, 2019 16:36:31 #
To Lemiaceae,
Good question and here is why I did 72 P/I. When I change the parameters on my image to 300 P/I at 22.6" x 13.8", the pixel dimensions are 6780 x 4140 and the size jumps to 80.3 MB's. What does that even mean in a 20MP camera? (the Pixels multiplied = 28 MPs) Should I simply have sent the image at that size?
Photodoc
Good question and here is why I did 72 P/I. When I change the parameters on my image to 300 P/I at 22.6" x 13.8", the pixel dimensions are 6780 x 4140 and the size jumps to 80.3 MB's. What does that even mean in a 20MP camera? (the Pixels multiplied = 28 MPs) Should I simply have sent the image at that size?
Photodoc
Aug 5, 2019 16:42:33 #
I always save mine at the max resolution for JPEG.
Are you saving as a JPEG or TIFF?
Are you saving as a JPEG or TIFF?
Aug 5, 2019 16:44:18 #
To Lemiaceae,
I resent the image to the printer using WeTransfer that can handle up to 2GB images. However, WeTransfer indicated the size was only 16MB. I did scale it for 300 DPI. Let's see what they say now.
Photodoc16
I resent the image to the printer using WeTransfer that can handle up to 2GB images. However, WeTransfer indicated the size was only 16MB. I did scale it for 300 DPI. Let's see what they say now.
Photodoc16
Aug 5, 2019 16:45:53 #
Aug 5, 2019 19:24:15 #
photodoc16 wrote:
Technohogs, br I took a photo at night of the sout... (show quote)
The 72 p/l is not a real number - it's a metadata tag that simply does a mathematical calculation that states what the image size would be if you printed at that resolution. You can change it to 5 dpi or 1200 dpi and there will be no difference in the file.
An image that has 4953 x 2980 px is more than enough to print a well-detailed image at the size you are asking for.
Exporting a jpeg at a quality of 12 will make huge files, and will not look any different than a quality of 8 or 9. But the file size will be a lot smaller.
However using email is not the best way to send image files - better to use Dropbox, OneDrive or some other cloud-based service.
For what it's worth, I had no problem printing images that were 2000x3000 from a Nikon D70 (6mp) to 40"x60" without issue.
Aug 6, 2019 07:50:04 #
photodoc16 wrote:
Technohogs, br I took a photo at night of the sout... (show quote)
Give https://wetransfer.com/ a try. Very simple, free and it works great.
Smile,
Jimmy T Sends
Aug 6, 2019 08:50:27 #
Aug 6, 2019 09:53:43 #
Besides the compression made to the image those 72 PPI are not helping. I agree with the gentleman that has suggested using 300 PPI instead.
Aug 6, 2019 12:12:08 #
Your problem is that you sent a 72ppi image to them. All printers have resolutions that perform best, and will request that number if asked. The usual range is from somewhere around 200 to 300ppi. I'm more experienced with shooting for stuff that goes on a 4 color press, and there everybody wants 300, which is basically equivalent to a 150 line screen.
I have heard that 72 is no longer recommended for the net, that 96 is now supposed to be better.
I have heard that 72 is no longer recommended for the net, that 96 is now supposed to be better.
Aug 6, 2019 15:53:24 #
photodoc16 wrote:
Technohogs, br I took a photo at night of the sout... (show quote)
Very Simplistically-For Future Viewing:
Divide 2980 (real height) by 13.8 (print height) and you have a potential resolution of 215ppi; your print proportions will cause a slight crop to the picture length.
This is enough resolution for a good print of most subjects, so obviously some of the information was lost in transmission.
Your changing the resolution will have no effect on the image quality, but selecting a resolution near your practical printing size (200ppi?) would guide you in making visual decisions.
Boris
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