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General photography questions and answers: Discuss Image Resizing batch?...Being new to photoshop progs, i need to resize all my images 300 dpi to send to a printer for ...
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Old 13-09-2007, 15:28   #1 (permalink)
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Image Resizing batch?

Being new to photoshop progs, i need to resize all my images 300 dpi to send to a printer for ultimate quality I have been told, can i do this in batch, I am doing a lot of weddings this year and next, normally i just take them to a family printer, but i have come across a printer that used to be very expensive years ago, but now they are megga cheap, and they come highly recommended, all my images have to be resized, or is there a program that would make this task quick, Nikon D50 user. software is not a problem, I have access to any pc software you can recommend, or maybe there is a step by step guide for this, sorry to sound stupid, just getting into programs learning slowly. thanks for any advice.
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Old 13-09-2007, 15:50   #2 (permalink)
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Re: Image Resizing batch?

Using PhotoShop, you can create an Action by manually changing one picture. After saving the Action, you can use it in batch mode to change a folder full of pics.
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Old 13-09-2007, 16:02   #3 (permalink)
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Re: Image Resizing batch?

dpi (dots per inch) isn't a measure of size. At least not directly. Your D50 uncropped produces images of 3008x2000 pixels (or dots)

which when printed @ 300dpi means a max size of: -

10" x 6.66" (Just under A4 size)

You can print larger than this apparent maximum but this is done with interpolation - ie software guessing what the intermediate pixel colour should be - allbeit an educated guess

Really you should need to tell us what print size you want then we can tell u how to achieve it.
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Old 13-09-2007, 17:20   #4 (permalink)
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Re: Image Resizing batch?

Just to add to what O-P says, the 'native dpi' of 300 dpi (or whatever) embedded in the file data is (almost) meaningless. What matters is the actual size of the image in pixels, the size in inches at which you want to print and the resolution in dots (or lines) per inch required by the printer.

Many commercial printers ask for 300 dpi, so if your image is, say, 3000 x 2000 pixels it can be printed at up to 10" x 6.6".

Desktop printers usually give best results at somewhere around 180 dpi, so the same image can be printed at about 16.6" x 11.1". In practice you can print larger this with little discernible loss of quality.
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Old 13-09-2007, 17:24   #5 (permalink)
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Re: Image Resizing batch?

Thanks for very quick input, I have just been given a adobe Photoshop book " Lightroom Essentials" I believe this software might help me resize my images, getting the software will not be a problem, there Is so much to learn using adobe products, and it is all down to time, but the images I normally work with are:
6x4 7x5 8x6 10x7-10x8 - sizes available that i might use could be 16x12~18X12
So I believe resizeing is to allow for cropping?, without loss of quality, I would like to read maybe an explanation on the subject, coming over from Film to digital, maybe someone as wrote an explanation on this, I know when I have done test prints at a local nini lab~ proofs I have lost some of the image, this could be why?, thanks for any more input. and thanks for your time.
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Old 15-09-2007, 20:46   #6 (permalink)
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Re: Image Resizing batch?

Pete, you can think of re-sizing and cropping much as you would have in a darkroom.

You place a specific size of photographic paper on the enlarger board then adjust the enlarger to fill the paper. Often you may over enlarge to ensure unwanted parts of the picture fall off the paper and is thus cropped.

In Photoshop or other imaging software consider the Resolution as setting the enlargement and you can visibly crop the picture using the cropping tool. If you continue to increase the enlargement in the dark room, you will find that the picture will appear softer and more grainy as you are limited by the information on the film. It is similar for digital, if you try to over enlarge the picture will appear softer and you will eventually see individual pixels rather than grain.

There are lots of video tutorials covering this and many basic photoshop techniques which is an excellent way of learning.
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Old 19-09-2007, 11:20   #7 (permalink)
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Re: Image Resizing batch?

Many thanks, I have lots of books, and will take in whats been said, cheers guys.
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Old 19-09-2007, 11:35   #8 (permalink)
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Re: Image Resizing batch?

by a strange coincedence, I just got sent this: -

How Big Can I Print by Thom Hogan
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Old 19-09-2007, 20:24   #9 (permalink)
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Re: Image Resizing batch?

That's rather at odds with the advice given by a big-wig at Epson on another forum, who said that anything over 180 dpi is unnecessary on a desktop printer and gives no additional benefit.

Maybe we could get some clarification on this from other printer manufacturers.
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Old 19-09-2007, 20:42   #10 (permalink)
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Re: Image Resizing batch?

best bet is to test yourself no? Should be easy to check.
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Old 19-09-2007, 20:49   #11 (permalink)
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Re: Image Resizing batch?

I've never seen any improvement at over 200 dpi on the i9950, although lately I've been printing from QImage and that reinterpolates to 600 dpi (allegedly) irrespective of the actual resolution.

I've not done much printing recently - house full of prints, no more wall space and basement out of action for another few weeks yet. I want digital frames to get a lot cheaper.
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Old 20-09-2007, 17:15   #12 (permalink)
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Re: Image Resizing batch?

I generally print between 200 and 230 on my Epson 1270. It is a long time since I checked but I could see a deterioration below 180 ppi. I am not sure that I could defintely tell 200 from 230. I suspect that with a more modern printer, you may be able to see the difference though.
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Old 20-09-2007, 23:54   #13 (permalink)
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Re: Image Resizing batch?

It's great to see such feedback, In this world of such high technology, sometimes you can get lost with all the new introductions, software, and equipment, I remember when I was a young lad, taking pictures and Home development, darkened out windows etc, it was great fun, but was a bit smelly, using chemicals, I sometimes think digital came so late, at the age of fifty next year, but we plod on, and learn a few things as we go along, great forum, one thing I always remember was in the early years I used to buy magazines, look at styles and try and copy them, and then after spending money on rubbish mini labs, always trying to correct my photography after recieving another bad batch of images back, until i found out that the labs chemicals needed replenishing, one thing that came to me was, snap away, forget what every one else was doing, and actually enjoy photography, which I do now, prob have a collection of over 50,000 digital Images, they will be here when Im gone, and thats the part that makes it all worth while, I love the social documentary side to photography, as in every picture tells a story.

I can take a raw image and with a few clicks in photoshop, really turn the image around.
the sad bit is, to have the knowledge needed, can take years of learning, reading, etc, just on photoshop alone, and then there is all the other programs also available, its all down to knowledge, I have books, but they are like bibles.

thanks for all the feedback, very interesting.

Pete Holt.
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Old 21-09-2007, 00:13   #14 (permalink)
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Re: Image Resizing batch?

I remember at one camera club I joined, I was shooting with a Nikormat EL, 35mm 1.4 lens, and we was asked to take a selection of slides. only having the one lens, all the images I put on slide were taken on that lens, when it came to my turn, every slide displayed, I was asked what lens I had used, people spent lots of money on long lenses, to have a similiar image, and they were amazed at the images, To get the close up, I walked nearer to the subject, etc, ? question, have we all now become, or are we expected to be technichians, is this the norm, with digital photography, because clever though are cameras are, compared to earlier cameras, we can achieve so much more using some software, I would love to compare digital enancement ~ and straight forward photography using the digital camera. ? does anyone out there take straight images, and not touch them up?..especially if you are pro....and my thought then leads to, does this actually spoil the taking of a photo.
My thoughts have come to mind, not being a knowledgable person, where Photoshop is concerned.
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Old 21-09-2007, 10:59   #15 (permalink)
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Re: Image Resizing batch?

In a way, there's really no such thing as an unmodified digital image. If you shoot in JPEG the camera will apply a preset tone curve, sharpening, contrast, saturation, etc - you can change these defaults, but all of them involve adjusting the basic (RAW) data to produce a usable image.

Similarly if you shoot in RAW the data will have to be converted by the processing software into a viewable image, and again this involves applying certain defaults specific to the camera and the appearance you have chosen.

The analogy with film is that different types of film produce different effects - colour and tonal balance etc - so which is strictly correct? It doesn't matter. There are no absolutes in all this, and it depends on what looks right to you. Many experienced film photographers use filters to create a more 'pleasing' effect - warming the scene, for example - but with digital you can do this afterwards and the result will be similar.
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