Uncompressed and jpeg are contradictory - by definition, JPEG is a compressed image. It wouldn't make sense to create a 50MB JPEG file..

If you want files that big, shoot in RAW, and when you export, export into 16-bit TIFF. I believe that should get you into 50MB+ territory...

Are you sure they asked for JPEG?.

48 MB is the Alamy stock agency standard, but we're talking uncompressed TIFFs here - not JPEG. .

... oh but well, I guess you can resave your 8 MB JPEG with a 40 MB long ITPC-header, that should do the job  *grin*.

Http://www.fotostart.dk << tutorials, guides etc...

Well, thats what I thought, but they seem to think they are the same. They won't accept 16bit or RAW. I will contact them as it just seems odd to me, maybe a typo..

Thanks for the message..

Dryad..

Nope not TIFF's they want JPEG's!!! I would be OK if it were TIFF's or RAW. Maybe they are having a joke with me lol...

Lol, what a strange requirement..

Well, you can go into Photoshop and resize your image to something crazy (probably 20,000 by 30,000 pixels?) and save it at 12 quality. That will give them their ridiculously large JPEG...

Think I am being a muppet, I read it wrong  Sorry guys. I thought that was an odd request..

So to be clear a TIFF is an uncompressed image?..

Lol, maybe. Its the way they worded it confused me. I think they have just taken Alamys requirements. They could get away with a picture from a 3MP camera half the time anyway as the images are not often very big...

TIFF is quite a flexible format that I believe can contain compressed or uncompressed data..

It's pretty odd to ask for an image by file size, since this tells you nothing about either the quality or the resolution. I'd go back and clarify what their requirements...

What they probably mean is that the file size should be minimal 48 MB *when uncompressed*. That effectively means 17 mpixels minimum. But to keep the real size down, they do want you to send that file in JPEG format.Johanhttp://www.johanfoto.com..

Uncompressed size is easy to calculate.ResolutionxColor_depthResolution: 1000000Color depth: 24 bit = 3 bytesResult 30 M uncompressed size. So they want a resolution of the file size/3 MP.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/..

TIFF can be saved compressed (typically lossless LZW is used) or uncompressed..

Saving a 16-bit TIFF uncompressed will take up a *a lot* of space, as mentioned earlier....

Http://www.fotostart.dk << tutorials, guides etc...

To get an uncompressed 8 Bit image that is 200 MB you will need 67 Megapixels, there are currently no consumer cameras that provide this resolution, even when scanning 35 mm film you won't get anywhere near there.Hasselblad backs only go up to about 40 MP if I remember correctly..

Even for 45 MB uncompressed you would need 15 MP which is at the top end of current cameras..

If they want jeg you will probably need more than 500 MP to get a 200 MB file..

Contrary to popular opinion it is possible to create lossless jpegs, they will however still be compressed..

Bye,Philip..

Fo uncompressed TIFFs you can very easily estimate the file size based on the image dimension or vice versa:.

200 MB = 200 * 2^20 Bytes.

For 8 Bit.

(200 * 2^20 Bytes) / (3 Bytes / Pixel) ~= 67 * 2^20 Pixels = 67 megapixel ~= 6 700 * 10 000 Pixel (2/3 Format).

For 16 Bit.

(200 * 2^20 Bytes) / (6 Bytes / Pixel) ~= 33 * 2^20 Pixels = 33 megapixel ~= 5 000 * 7 500 Pixel.

Bye,Philip..

Thanks guys..

I have since spoken to them which has not really helped..

They want a file size minimum of 48MB but it must be a JPEG as they won't accept TIFF's. It must be 8 bit (which I think I'm using)..

The 48MB they want is compressed! But they say a camera with up to 6MP is fine..

Now, my 30D has 8MP but the biggest JPEG I can get (once converted from RAW) is around 5-7MB, I have changed the images size on one of them, which then shows as much larger but when I check the properties it still says it's 7MB..

This seems to be either really hard, or I'm being a complete goose!.

Dryad..

It sounds like they don't really know what they are talking about - a 48MB JPEG is excessively and needlessly large. There is no camera, not even 39MP Hasselblads, that can generate JPEG files like that..

But if they really insist, as I said before you can upscale your images in photoshop to some crazy dimensions, such as 20,000x30,000 pixels, and save it at JPEG 12 quality, which should get you up in the 50MB+ range...

Actually you don't need to be that excessive (just did some quick calculations). Something like 6000x9000 pixels should do the trick...

Nathan Yan wrote:.

Actually you don't need to be that excessive (just did some quickcalculations). Something like 6000x9000 pixels should do the trick..

Which is 20 x 30 inches at 300dpi. Which is a perfectly reasonable thing..

(although the fact that the client is specifying file size, rather than resolution, still indicates that perhaps they don't know what they're talking about!).

To the OP: What is the purpose of these images? Are they to be used to make large prints like 20x30 inches?..

I'm not sure if that will necessarily help that much, since JPEG is very dependant on the actual information, which won't change much just by upscaling..

A completly black image won't differ much in file size, wether it is 200*300 or 20000 * 30000 pixel..

I think you can increase the file size by sharpening the image after upsizing, and if you want to really make sure you hit the correct size, just add a sprinkle of noise..

Bye,Philip..

I suspect the person you are communicating with is either new and attempting to interpret the submission requirements, or just an office admin type that is stating verbatim what he/she thinks is required without understanding the technicalities..

I havent sold images to or through stock agencies, but Ive licensed a fair amount of images (for an amateur) to ad agencies, publishers, etc., and I havent come across this before. I have found there is a considerable amount of misunderstanding related to file size, JPG, TIF, DPI, PPI, etc..

You could submit a test image for them to review a processed JPG, without increasing the pixels, saved in the highest PS quality, and see what they say..

Best regards,Doughttp://pbase.com/dougj.

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