48mb JPG from a 7mb RAW file?

[Fingers]

Thought I might give this a try www.alamy.com to sell some pics.

They only want however 48mb jpg's !!

So how does one do this from a RAW file from a EOS 20D or is this not poss with my kit?

 

[table1349]

Follow the guidlines they posted at the site:

<H2 id=guidelines>Submission guidelines

We need:

• JPEG’s saved at a high quality setting (i.e. Photoshop level 10 or above).
• Alpha-numeric file names ending in .jpg.
• RGB files, not single channel greyscale or CMYK.
• Uncompressed file sizes of between 48MB and 200MB. This means you should make your JPEG file from an 8 bit TIFF file that is at least 48MB. Our maximum size for the uncompressed file is 200MB.

</H2>

 

[DHammer]

If you really search their requirements, its 48 to 200 megs uncompressed in 8 bit tiff form. So the jpeg will be much smaller.

 

[Fingers]

Like I say, how can you create a 48mb file JPG from a RAW file?

Following the instructions does not get me anywhere near 48mb.

When you try and upload a JPG file it actualy says its under the 48mb so they are indeed after JPGs of this size?!!!!!

Even saving the RAW file as a TIFF only produces around 40mb.

Can anyone make any sence of this at all, why are there wanting to bloat the size of a file?

What sort of size file comes off an EOS D1 ?

 

[Jestev]

Like I say, how can you create a 48mb file JPG from a RAW file?

Following the instructions does not get me anywhere near 48mb.

When you try and upload a JPG file it actualy says its under the 48mb so they are indeed after JPGs of this size?!!!!!

Even saving the RAW file as a TIFF only produces around 40mb.

Can anyone make any sence of this at all, why are there wanting to bloat the size of a file?

What sort of size file comes off an EOS D1 ?

The JPEG that you make to upload onto their site will not be 48mb. The uncompressed file that you create the uploadable JPEG from should be 48-200mb in size.

 

[Fingers]

The JPEG that you make to upload onto their site will not be 48mb. The uncompressed file that you create the uploadable JPEG from should be 48-200mb in size.

Two things

"The uncompressed file that you create the uploadable JPEG from should be 48-200mb in size."

How do you do this from an 8mb RAW file.

"The JPEG that you make to upload onto their site will not be 48mb."

I tried to upload an 8mb JPG to the site and it said it was too small!

Forgive my greeness here, but I am new to RAW format and am still no further forward here.

 

[Helen B]

The 20D is an 8.2 megapixel camera. An uncompressed 8-bit-per-channel RGB file will be about 8.2 x 3 = 24 MB file, give or take a millibit or two.

Here is what Alamy suggest:

"Interpolate (upsize) the file to at least 48MB using a specialist, professional software package. We recommend Genuine Fractals&#8482; although other software is equally acceptable, including Abobe Photoshop versions 7 or higher (if the bicubic option is used). Do not use &#8220;step&#8221; or incremental interpolation. Check your software&#8217;s default settings to ensure that sharpening is turned off. All results are assessed on their merits, regardless of the method used."

A 48 MB uncompressed 8-bit file is the equivalent of about 16 megapixels.

Best,
Helen

 

[Fingers]

Ah OK thanks Helen.....

 

[Fingers]

Ok So here I am at 3000 dpi !! 139mb

Can anyone tell me if there is any advantage to this? Does it meen it can be printed off the size of a house?

I am flumuxed with these massive sizes.