If the smaller files are 22.2 MB and all are the same size then the
difference is caused by 8 bit vs 16 bit. But, if the smaller files are
of varying sizes then the difference is caused by compression.
Chuck Norcutt
Jan Steinman wrote:
>> From: "Jon Mitchell" <olympus@xxxxxxxxxxxxxx>
>>
>> Looking at the DNG files from my E330 (raw files, converted to dng
>> with
>> adobe dng converter), they are coming in at 3136x2353 pixels (7.4MP).
>> With adobe rgb, 16 bits / channel, and 300ppi settings when I open
>> them
>> in Photoshop. The file size is around 18-20 MB.
>
> Something wrong here. If you have two bytes per channel, and three
> channels per colour, you should have 44.4 MB:
> 7.5 Megapixels times 3 (for R, G, and B channels) times 2 (for two
> bytes per channel) = 44.4 Megabytes
>
>> What am I missing here ? How can 2 files with almost identical number
>> of pixels, same other details, etc., be so vastly different in size ?
>
>
> I suspect your first example is only one byte per channel.
>
> :::: Those who don't understand UNIX are condemned to reinvent it,
> poorly. -- Henry Spencer ::::
> :::: Jan Steinman http://www.Bytesmiths.com/Services ::::
>
>
>
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
>
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|