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PNG file format and JPG the often unused other arguments (and useless?)
Jan 14, 2016 18:13:50 #
PNG can be saved onto a much higher color depth than a JPG using 256T option (32 in PS CC). This mode is referred to 'teracolor'... 281,474,976,710,656 colors!!!
The file is then at least three times that of a barely compressed JPG...
So a big hit against JPG here with its mere 16 millions...
Then you have the PNG dimension limits 2Gx2G (2g=2,147,483,647pixels) vs JPG 64kx64k (64k=65,536pixels)
Coming down to reality a PNG used at this extreme needs a highly specialized software like those in research and medical fields.
Most software when it comes to dimension give up after 30kx30k, well within the range of both format. As to the number of colors displayed it all depends on your hardware limitation(s).
The file is then at least three times that of a barely compressed JPG...
So a big hit against JPG here with its mere 16 millions...
Then you have the PNG dimension limits 2Gx2G (2g=2,147,483,647pixels) vs JPG 64kx64k (64k=65,536pixels)
Coming down to reality a PNG used at this extreme needs a highly specialized software like those in research and medical fields.
Most software when it comes to dimension give up after 30kx30k, well within the range of both format. As to the number of colors displayed it all depends on your hardware limitation(s).
Jan 14, 2016 18:29:45 #
Jan 14, 2016 18:33:29 #
I use them a lot when compositing rendered (3D graphics programs) images into photographs etc as PNG images have transparent backgrounds.
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Jan 14, 2016 19:17:45 #
Rongnongno wrote:
JPEG will only allow me to print an image 18 feet by 18 feet. A PNG, however, can be over 500 feet in each dimension! Then you have the PNG dimension limits 2Gx2G (2g=2,147,483,647pixels) vs JPG 64kx64k (64k=65,536pixels)
This is a difference that you need?
Jan 14, 2016 23:53:20 #
Apaflo wrote:
JPEG will only allow me to print an image 18 feet by 18 feet. A PNG, however, can be over 500 feet in each dimension!
This is a difference that you need?
This is a difference that you need?
We post signs at the railroad museum telling people not to climb on the equipment. I'd be willing to try the 18 foot signs, but we might have to go larger. For one sign, I'm thinking 125 feet long by 18-20 feet high. We can use the smaller signs to make the "Do Not Write or Climb on Signs" signs.
Jan 15, 2016 01:25:37 #
Mogul wrote:
We post signs at the railroad museum telling people not to climb on the equipment. I'd be willing to try the 18 foot signs, but we might have to go larger. For one sign, I'm thinking 125 feet long by 18-20 feet high. We can use the smaller signs to make the "Do Not Write or Climb on Signs" signs.
Hire a sign painter, not a sign printer! :-)
Jan 15, 2016 02:46:55 #
Apaflo wrote:
Hire a sign painter, not a sign printer! :-)
Printers have spell checkers. We had a stencil on several pieces of equipment that said, "NO CLIBMING"!
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Jan 15, 2016 06:39:05 #
Rongnongno wrote:
PNG can be saved onto a much higher color depth than a JPG using 256T option ...
You can also save as TIFF and get the ultimate universally recognized format, not much larger than a 48-bit PNG. The only thing missing is a transparency layer that nobody uses to print an image.
It's not surprising that you never heard of the JPEG 2000 and JXR standards that offer greater bit depth, loss-less compression and transparency (like PNG).
Only a handful of editors (like Capture One) can both open and save to JPEG 2000 and a few more (like Corel) can save as either one but can't open them. The standard MS viewer can display a JXR image but you need InfanView to see a JPEG 2000.
They have not caught on because nobody really needs another standard.
Jan 15, 2016 08:09:52 #
Rongnongno wrote:
PNG can...
Beware though. PNG does not support EXIF data.
Jan 15, 2016 08:12:08 #
Dale40203
Loc: Louisville, KY
selmslie wrote:
You can also save as TIFF and get the ultimate universally recognized format, not much larger than a 48-bit PNG. The only thing missing is a transparency layer that nobody uses to print an image.
You CAN save a TIFF file with transparency. It will be a larger file than one with an opaque background, but if you have a transparent background in a Photoshop file, TIFF with transparency is one of the SAVE AS options.
Jan 15, 2016 08:29:38 #
pecohen wrote:
Beware though. PNG does not support EXIF data.
This is the reason that I do not post in PNG.
Other than that, it has its place in the print world.
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Jan 15, 2016 08:42:37 #
zigipha
Loc: north nj
OddJobber wrote:
My printer only has 10 colors.
mine has only 4, cyan, magenta and yellow. It has black so I guess that's 4.
:P :P :-P :-P :roll: :roll:
Jan 15, 2016 09:23:49 #
DavidPine
Loc: Fredericksburg, TX
I use PNG for posting on Facebook. I'm quite happy. I also resize to 1280 on the long side.
Rongnongno wrote:
PNG can be saved onto a much higher color depth th... (show quote)
Jan 15, 2016 11:25:55 #
selmslie wrote:
You can also save as TIFF and get the ultimate uni... (show quote)
I wonder how many could tell the difference visually (no computer) between JPG and PNG if all the file information were removed and both originated from the same raw file and were processed by the same individual and were of equal physical size? :roll: :roll: :roll:
Jan 15, 2016 12:01:10 #
tropics68 wrote:
I wonder how many could tell the difference visually (no computer) between JPG and PNG if all the file information were removed and both originated from the same raw file and were processed by the same individual and were of equal physical size? :roll: :roll: :roll:
It would be impossible to tell on a normal computer (the only kind I know about) to tell a PNG from a JPEG or a TIFF. All of them display using 24-bit color - 2^8=256, 256^3=16,666,216 colors. Even a TIFF with 2^48 (2.81E14) possible colors gets reduced to 24-bits for the display.
We can't really distinguish that many colors any more than we can distinguish 256 shades from black to gray to white - on the computer or on paper.
The extra bits are not for display or printing purposes. They are to allow editing of the image without producing banding.
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