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General photography questions and answers: Discuss scary file sizes :(...Hey all just a quick qq..Ive been looking at Alamy to try uploading photos for sale, and I was sifting ...
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Old 14-07-2009, 21:57   #1 (permalink)
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Red face scary file sizes :(

Hey all just a quick qq..Ive been looking at Alamy to try uploading photos for sale, and I was sifting thru all the QC stuff and it was asking for JPEG file sizes of around 46mb for a picture to pass QC..and im thinking hmmm,,WHAT THE HELL ....i only have a nikon D40X, i dont shoot RAW cos i find it too much of a hassle to process them so i use jpeg...I dont understand how they have file sizes tht big on alamy...

For example i just took a photo of my camera to my pc and its an un-edited Jpeg and its only 4.4mb so what am I doing wrong..or issit that my camera just does not take high enough quality images

Any explination wud be gr8ly apreciated

Thanks all
Toby
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Old 14-07-2009, 22:31   #2 (permalink)
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Re: scary file sizes :(

If you read the preparation instructions they expect you to scale up the image to approx 5200 pixels on the longest side using interpolation. If you save this a a tiff they usually come out around 52Mb (a good editing format since it doesn't degrade the image during editing as jpgs do).

If you convert it to a jpg it will usually come out between 6Mb and 13Mb dependent on the image. I would upload that version.

This all adds up to a lot of storage for one image, for me the raw is 11 - 12 Mb, the tiff is around 52Mb and the jpg is around 10Mb. Thats about 75Mb for every image

All backed up on dual layer DVDs about 8.5 Gb each.

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Old 14-07-2009, 23:42   #3 (permalink)
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Re: scary file sizes :(

Try AVCHD video if you really want scary file sizes.

What Steve says is bang on - they're wanting the uncompressed (i.e. TIFF) file, but IMO it's all rather behind the times as a good low-loss JPEG is perfectly adequate for 99% of commercial purposes. Maybe they're just trying to scare off anyone using a cameraphone.
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Old 15-07-2009, 09:12   #4 (permalink)
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Re: scary file sizes :(

Actually silkstone they specify JPEGs. The instructions state that the JPEG must be made from a TIFF file of between 48-55MB and must be a maximum quality JPEG. For me that usually turns out a file size of between 7-12MB.

I select my images and do the processing in Lightroom. I then export as an 8-bit TIFF (Alamy request 8-bit rather than 16-bit). I then use Photoshop to interpolate the image up to around 50MB then export that as a JPEG. I'm with Steve on the storage issue, roughly the same figures here and the same solution - everything archived onto DVDs (although single layer ones here).
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Old 15-07-2009, 11:25   #5 (permalink)
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Re: scary file sizes :(

Get yourself a 5d MkII and you'll soon see how easy it is to get massive file sizes LOL.

In fact it gave me a problem because I have an Epson P2000 40Gb portable hard drive and viewer which i love to bits. But when I tried opening even the jpg never mind the RAW file on there it just said 'Get lost, that's way too big!' or words to that effect!

I always shoot RAW, wouldn't even consider shooting in jpg only (though fine with storing a processed file as a jpg later). I shoot a jpg with the RAW because on the PC Explorer doesn't show the latest RAW files so the jpg acts as a quick reference. So what I now do for my P2000 is record a low res jpg with the RAW. I have found this makes a jpeg small enough to view properly on the P2000 and still looks fine. The smaller size is fine on the PC anyway and I am not that concerned with the finer details of the picture. No need to make a large jpeg, if I want a high quality jpeg I can make it from the RAW file or TIFF file.

For quite a few years, publishers have demanded 50Mb file sizes and much for the reason stated before: they want pictures from professionals, not from people with 5Mb compacts or Nokia N97 mobiles!

Cheers,
Rob
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Old 15-07-2009, 12:54   #6 (permalink)
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Re: scary file sizes :(

i have a problem with backing up as i dont have a DVD writer so i have to live in hope that my external hard drive doesnt pack up.
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Old 15-07-2009, 16:42   #7 (permalink)
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Re: scary file sizes :(

I don't want to worry you but that is why I bought the DVD-writer. External hard drive packed up. Luckily it gave me plenty of warning, started going intermittently faulty before it died totally, so I was able to get everything off. But it gave me a good scare.
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Old 17-07-2009, 21:13   #8 (permalink)
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Re: scary file sizes :(

I'm actually going to try a different approach using old/ new technology. For this type of 'considered' photography, Idon't really need loads of automatic controls as I have on my DSLR.

Therefore I'm going to try using the new Kodak Ektar 100 (film ) and scanning the neg directly at 4000 DPI (the max my scanner will realy go to). This will create a 50Mb tiff file. I will then have the archive copy as a neg, very old school.

Kodak Ektar 100 gives a saturated image that enhances colour, hopefully that's the sort of thing people like, with the correct composition.

I'll let you know how it goes.
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