Re: Corelating in Camera Pixel Count (RAW format) and file size?

["Herschel@xxxxxxxxxxxxxxxx" <herschel@xxxxxxxxxxxxxxxx>]

Because MP are area and resolution is linear

1000 x 1000 is 1mp

1400 x 1400 is 2 mp

MP is double but resolution is only 40% more

3100 x 3100 is 10MP

2500 x 2500 is 6 MP

10MP is 1.2 x resolution of 6MP

(3100/2500)

Herschel

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On 12 May 2010, at 14:41, Kostas Papakotas <clenchedteethphotography@xxxxxxxx> wrote:

thanks herschel but I still cannot understand how can the 10 & 6 Mp are so close in size while the 2mp is considerably less.....

=============================================
No matter what, CHEER UP MY FRIENDS! Life is too precious to jump the other side of the fence...

kostas papakotas / clenched teeth photography
http://clenchedteethphoto.multiply.com

--- Στις Τρίτ., 11/05/10, ο/η Herschel@xxxxxxxxxxxxxxxx <herschel@xxxxxxxxxxxxxxxx> έγραψε:

Από: Herschel@xxxxxxxxxxxxxxxx <herschel@xxxxxxxxxxxxxxxx>
Θέμα: Re: Corelating in Camera Pixel Count (RAW format) and file size?
Προς: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxx>
Ημερομηνία: Τρίτη, 11 Μάιος 2010, 14:44

Here is my simplifief version... Digital color pics are made in the oldest way. The camera shoots 3 B&W images. Each through a red green and blue filter. These are then combined to make the colour (RGB) image. But the green image is twice the size of the other two. In a nutshell the raw file is just the black and white data and the information about the array it ws shot through. The process of making the colour file from these images is RAW conversion. All very product specific, secret mixtures and algorithms to combine and process the 3 pictures. As far as I can tell... The real un processed resolution would be about the size of the red or blue image...1/4 of the megapixel size of the camera

Sent from my iPhone

On 11 May 2010, at 14:42, Pablo Coronel <pablo.coronel.70@xxxxxxxxx> wrote:

My understanding is that RAW files are a snapshot of what the sensor recorded.... no manipulation
http://www.luminous-landscape.com/tutorials/understanding-series/u-raw-files.shtml

could it be that MP count does not work on RAW?

2010/5/11 Kostas Papakotas <clenchedteethphotography@xxxxxxxx>

hi all!

 

this I noticed soem time ago in my Pentax K10D.....

 

took a scene in 10MB and 6MB.....pxel count was

 

10Mp - Raw - 12359 KB

06Mp - Raw - 11479 KB

10Mp - JPG -  3069 KB

06Mp - JPG -  1707 KB

 

I have this question: 10/6*1707=2845 which is cloase what one would expect on JPg pixel count....

 

But why such a small difference between the RAW files? (sorry i do not recal what a 2Mp size would be). Any chance the K10D sensor is a 6Mp one and teh 10Mp files are extrapolated? Or it is just pure sensor data and final picture size is calculated upon conversion to TIFF or JPEG?

 

thanks, kostas

===========================================
No matter what, CHEER UP MY FRIENDS! Life is too precious to jump the other side of the fence...

kostas papakotas / clenched teeth photography
http://clenchedteethphoto.multiply.com