cant get large image file fron eos 5d

[superqaz]

hi

with eos 5d mk1 i am suppose to be able to get a 36mb image but despite checking obvious setting i can only get about 17mb raw

just in case anyone-is thing of suggesting buy a mk11 , thats not the solution:)

thanks

[Paul2660]

Take the raw and convert it to a 16 bit tiff. What is your file size now? 
17mb is about the right size for 11mp Rae file.

Paul

[superqaz]

paul

it was Alamy stock agency that put on there site that it capable of that size file , i dont think they meant to obtain that size by converting it

ur standard advice for preparing digital camera files

 heres what they say:
for Alamy is as follows:    Use a pro-level camera with a “true” (non-interpolated) resolution of at least 6 megapixels. This will give an uncompressed file size of at least 17MB at 8 bit

[Bart_van_der_Wolf]

with eos 5d mk1 i am suppose to be able to get a 36mb image but despite checking obvious setting i can only get about 17mb raw

Hi,

EOS 5D is 4368 x 2912 pixels, or 12,719,616 pixels. Each pixel has 3 bytes (R/G/B) making 38,158,848 bytes. So you need to down-sample to something like 2912 x 1952 pixels, x 3 bytes is 17 MB. So a 3000 x 2000 pixel image size should be enough.

'Raw' camera files are compressed and therefore vary in size depending on image content.

Cheers,
Bart

[JeanMichel]

Hi,
You 5D is a roughly 12 MP camera. The raw file (CR2) contains the raw information of 6 mp green-filtered pixels, 3 mp of red-filtered pixels and 3 mp of blue-filtered pixels. Search for Bayer pattern to see  a schematic of the typical pixel array on your sensor. The raw converter (ACR, LR, DPP, etc,) de-mosaics that raw data into a roughly 36 mp RGB file. The algorithm used to transform the raw data into a full RGB file is black magic to this chemical days photographer. It used to be that photography was a combination of physics, chemistry and magic, now it is physics, statistics and magic!
Jean-Michel