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04/22/2005 09:56:02 AM · #1 |
is there a way to take a pix from a 3.3mp camera, put it in PS, and increase the resolution?
I don't mean add pixels, or make it clear or sharp, but actually making the resolution better?
Do I know what I mean? Do you know what I want? or is the sky falling?
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04/22/2005 10:00:26 AM · #2 |
Without adding pixels the only way to improve the resolution is to print smaller.
How big do you want to print? To determine the resolution for the size you need to do a little math.
e.g. Lets say your image is 1500 x 1200 (just for ease of calculation)
An 8 x 10 made from this image would be 150 dpi (1500 / 10). If you want 300 dpi then you'd have to print a 4 x 5.
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04/22/2005 10:21:44 AM · #3 |
but I was thinking, and have not actually done this mind you, but, if you took that 1500x 1200 image, and increased it gradually in say 10-20% increments, saving. Reaching say double, 3000x 2400.
taking that image after saving, reduce to a normal print size, 8x10, will this give better resolution? will this pixellate? will it do anything? is the sky still falling?
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04/22/2005 10:30:31 AM · #4 |
Originally posted by swinging_johnson_v1:
but I was thinking, and have not actually done this mind you, but, if you took that 1500x 1200 image, and increased it gradually in say 10-20% increments, saving. Reaching say double, 3000x 2400.
taking that image after saving, reduce to a normal print size, 8x10, will this give better resolution? will this pixellate? will it do anything? is the sky still falling? |
This is the desired method of adding pixels (10% at a time). The result will depend on the original image and you will have to sharpen a bit after you've changed the image size.
I didn't mention this to start since you asked for a method without adding pixels.
Message edited by author 2005-04-22 10:31:56.
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04/22/2005 10:34:35 AM · #5 |
| Isn't this simply interpolating? It's stretching pixels, not adding any more detail. Why do you add 10% at a time? |
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04/22/2005 10:37:32 AM · #6 |
I'm not sure what I was asking, I just had this brain storm, and wanted to see if I was on some sort of track.
Interpolating? sorry, what does this mean? I am not a college grad, just a poor, semi-educated, blue collar, Kalifornian.
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04/22/2005 10:37:52 AM · #7 |
It's called resampling and yes pixels are being added.
Check out this tutorial for information about resampling.
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04/22/2005 10:39:43 AM · #8 |
You can Iterpolate an image in PS, all the way to about 30%.
If you use RAW you can chose the range in the "dimension" drop down. |
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04/22/2005 11:01:32 AM · #9 |
Resampling in small increments ("step interpolation") is beneficial because if handles details much better. To understand this, imagine a 100x100 image you wanted to expand to 1000x1000 (ridiculous, I know, but imagine). The original has 1000 pixels total, the upsized one will have a million pixels. That means you need to ADD 999,000 pixels to the image.
Now, an interpolation process means taking the "value" (both color and darkness) of the surrounding pixels and making some sort of an average of that and applying this new value to the new pixel being added. If you upsized this 100x100 image to 1000x1000 in a single pass, you can see this would result in some extremely arbitrary "decisions" being made on what constitutes the average of "adjoining" pixels. By upsampling in small increments, you create a finer gradation in that "decision making" process. The result is by far most noticeably better in images that have contrasting diagonal lines, which will come out MUCH less jaggy with step interpolation.
Robt.
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04/22/2005 10:52:43 PM · #10 |
Getting more used to how Photoshop works gives me alot more insight on hw the cogs turn.
thanks for the responces.
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