Help on sizing
Feb 14, 2023 15:17:09 #
Ok, I may know how to take photos, but sizing is another thing.
I'm entering a photo into a contest the requirements are:
2800 Pixels on the long side
Maximum dimension is 3000 pixels on the long side
Maximum file size 5MB
Recommended format PNG
So below is what I put into Lightroom, but the file ends up being 13mb. How do I get it down to 5mb and keep the 2800 pixels on the long side?
Thank you!
I'm entering a photo into a contest the requirements are:
2800 Pixels on the long side
Maximum dimension is 3000 pixels on the long side
Maximum file size 5MB
Recommended format PNG
So below is what I put into Lightroom, but the file ends up being 13mb. How do I get it down to 5mb and keep the 2800 pixels on the long side?
Thank you!
Feb 14, 2023 15:29:02 #
Feb 14, 2023 15:41:06 #
Are you sure PNG is a requirement? That seems to be the limiting factor for file size. You might try exporting as Jpeg with a 5 MB limit, then re-export as a PNG.
Feb 14, 2023 15:41:14 #
If you can find out if DNG is a possibility you can convert to DNG with lossy compression.
Feb 14, 2023 15:59:13 #
an image of 2800x1800 would be of about 5MP and would need 15MB uncompressed with 8 bit per color channel. The PNG format can only compress about 10% (because it's lossless) so I don't think it's possible with PNG.
Feb 14, 2023 17:35:05 #
Tomfl101 wrote:
Are you sure PNG is a requirement? That seems to be the limiting factor for file size. You might try exporting as Jpeg with a 5 MB limit, then re-export as a PNG.
They just suggested the PNG. I can try JPEG. Had not thought of that. Thanks
Feb 14, 2023 17:35:53 #
BebuLamar wrote:
an image of 2800x1800 would be of about 5MP and would need 15MB uncompressed with 8 bit per color channel. The PNG format can only compress about 10% (because it's lossless) so I don't think it's possible with PNG.
Ok, will try something else. They just said PNG was recommended, not had to be.
Feb 14, 2023 17:36:51 #
R.G. wrote:
If you can find out if DNG is a possibility you can convert to DNG with lossy compression.
PNG was only the suggested best way. Will use something else. I need to learn about lossy compression….
Feb 14, 2023 17:37:28 #
twowindsbear wrote:
Try reducing the resolution. That may work. Good luck in the contest, too.
Thanks! I have a few ideas now on how to reduce.
Feb 15, 2023 01:24:49 #
BebuLamar wrote:
an image of 2800x1800 would be of about 5MP and would need 15MB uncompressed with 8 bit per color channel. The PNG format can only compress about 10% (because it's lossless) so I don't think it's possible with PNG.
Is it possible that the people running the contest don't know what they're asking for?
Feb 15, 2023 09:47:14 #
R.G. wrote:
Is it possible that the people running the contest don't know what they're asking for?
I don’t know, maybe!
Feb 15, 2023 10:00:59 #
Photolady2014 wrote:
I don’t know, maybe!
The suggestion for a PGN is a strong indication.
Feb 15, 2023 10:12:34 #
PNG file format is great for vector illustrations. It's a bummer for raster images for it greatly increases the file size with no appreciable difference in quality or print.
It's a simple test for yourself. Take any image you have as a Jpeg and then do a Save As to PNG. When finished saving, compare the two file sizes, and OMG, what a big file you have. Then when you open it you will not see any difference between the two even at the deepest pixel peeping.
We use PNG in vector graphics for it can be saved with a transparent background making it handy for bringing PNG assets in and floating them over other images.
It's a simple test for yourself. Take any image you have as a Jpeg and then do a Save As to PNG. When finished saving, compare the two file sizes, and OMG, what a big file you have. Then when you open it you will not see any difference between the two even at the deepest pixel peeping.
We use PNG in vector graphics for it can be saved with a transparent background making it handy for bringing PNG assets in and floating them over other images.
Feb 15, 2023 11:00:59 #
I've entered a lot of shows. GIVE THEM WHAT THEY ASK FOR! If they want PNG, give them PNG. They have their reasons. I normally do this in PS, not in LR. You'll see a difference in the results and I think it's easier. If you insist on using LR, I'd suggest using the "limit size to" option and set it to 5.
Feb 15, 2023 11:06:35 #
There is NO reason to create a 240 ppi file for display on a monitor (for printing: OK) which will display only 72 ppi regardless of what you send it. See what that reduction does. Best of luck.
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