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Old 11-10-2007, 08:52   #1 (permalink)
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Upsizing an image

I'm trying to up size an image but it's all getting a little

Firstly I would like to keep the file size as big as possible..........

I start off with a RAW file pixel dimensions 46.8M

I then crop the image (5in X 3in @ 300 res) = 7.72M (pixel dimensions).

Convert to 8 Bit = 3.86M (pixel dimensions).

Save as a Jpeg = final file size of 735.4K.

I've read when cropping to have the resolution box clear.......this does increase the file size but the resolution is then 554

An easy step by step guide would be greatly appreciated

Cheers Ian.
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Old 11-10-2007, 09:31   #2 (permalink)
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Re: Upsizing an image

Not sure about an easy guide, but the most confusing thing, I find, is resolution. This is totally irrelevant to sizing an image or displaying an image. It is ONLY used in printing

So, ignoring resolution, just resize away!
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Old 11-10-2007, 09:38   #3 (permalink)
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Re: Upsizing an image

Sorry Mark I should have said I need to send the image to print.
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Old 11-10-2007, 10:07   #4 (permalink)
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Re: Upsizing an image

Surely you would not ignore resolution for printing.
From the jpeg say (I save mine in TIFF to allow for manipulation and multiple changes ),the size may be 48"x 32" (from my canon) @ 72dpi. Reducing this to 6X4 would give a file size of 365kb. This will give very poor quality printing especially on the edges showing pixelation.

Opening the file up again and displaying 48"X32" @ 72 dpi and selecting maintain file fize and reducing it 6"X 4" gives a dpi of 576dpi.
Usually you will not require any more than 300 dpi for normal viewing of you prints.
I may have missed the full point of the original thread but hope this helps.
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Old 11-10-2007, 10:31   #5 (permalink)
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Re: Upsizing an image

The 'native resolution' - 300 dpi, 72 dpi, etc - causes more confusion than anything.

For most practical purposes it is completely irrelevant. All that matters is the actual size in pixels, and the dimensions in inches (or whatever) at which you want to print. For example, if you have an image 3000 pixels across and you print it 10 inches wide, the resolution will be 300 dpi (whatever the native resolution may say).

The only real purpose of the native resolution is to give a 'starting size' if you insert the image into, for example, a dtp application, but even here you can resize it by dragging the handles to whatever you want.

If the RAW converter does not allow resizing before conversion, the best plan is to save it as a full-size 16-bit TIFF. Then open this in your favourite image editor and resize (using bicubic interpolation) to whatever pixel dimensions you want. You may also be able to choose a 'native resolution' but remember that this is just a bit of data embedded in the file, and does not affect the actual size in pixels at all.

You can do better than bicubic interpolation by using software such as Genuine Fractals, and this makes a difference if you're upsizing a lot. Also printing apps like QImage can upsize very effectively as part of the output to the printer, but that's for desktop printers rather than commercial print shops.

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Old 11-10-2007, 18:32   #6 (permalink)
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Re: Upsizing an image

Cheers fellas for the replies

So I take it, it doesn't matter that the res is more than 300? and it is correct to leave the resolution box empty when cropping.

This is for printing by the way
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Old 11-10-2007, 19:08   #7 (permalink)
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Re: Upsizing an image

I generally set the native resolution to 300 because commercial printers like to see that, but really all that matters is the actual size in pixels.
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Old 11-10-2007, 19:15   #8 (permalink)
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Re: Upsizing an image

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Originally Posted by silkstone View Post
I generally set the native resolution to 300 because commercial printers like to see that, but really all that matters is the actual size in pixels.
When I crop with the res @ 300 the file is smaller than when I leave the res box empty......

When I upload to Photobox the larger file gives me higher quality settings (those little green boxes) when I'm trying to print A4 or A3.
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Old 11-10-2007, 20:04   #9 (permalink)
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Re: Upsizing an image

Is this with Photoshop? Sorry, I don't use it so I'm not sure how PS handles crops. It sounds as if it is not only cropping but also resizing/resampling if you specify a native dpi, which I wouldn't have thought was necessary or desirable.

If leaving the box empty gives the largest file and the highest quality, that's what you want.
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Old 11-10-2007, 20:10   #10 (permalink)
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Re: Upsizing an image

This is in CS3 Silky.

I will have another play around now that Emmerdale & Eastenders has finished
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Old 11-10-2007, 21:16   #11 (permalink)
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Re: Upsizing an image

try to resample the image in intervals of 10% using the bicubic smoother option, lets say your image is 1000 x 900, you go to 1100 x 990 and so on until you get the size you want. its one of few ways you can do it with Photoshop, it will reduce some artifacts, but if you do this often its better if you buy specialized software like Alienskin BlowUp
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Old 11-10-2007, 21:29   #12 (permalink)
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Re: Upsizing an image

Thanks j sotelo

I've read that using the 10% method in CS3 does a very good job.
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