G
Guest
Guest
Archived from groups: rec.photo.digital.slr-systems (More info?)
John Francis wrote:
>>It may also, rather than specific sharpening, be artifacts of interpolating
>>seperate R,G,B sensors into RGB pixels that makes sharpening-like artifacts in
>>the RAW image.
>
>
> I think you may have a misunderstanding of just what a RAW image is.
> It is a direct measure of the sensor values, prior to any conversion
> to RGB pixels. Interpolation artifacts, etc., would be introduced
> during processing stages that take place later on in the chain, and
> so are not present in the RAW capture.
In any case, at some point the RAW image may converted to a "lossless" digital
format such as TIFF. In that conversion, regardless of where it takes place,
some artifacts of conversion are introduced. They hardly have a choice but to
be produced as interpolation (of whatever variety) to fill an RGB pixel from
spatially separated pixels must be imperfect.
>
> In general the only camera settings that affect the content of a RAW
> image are the effective ISO (maybe including exposure compensation),
> white balance (sometimes), and possibly the contrast. Other settings
> such as sharpening will be generally be recorded along with the data,
> and may very well affect the way the manufacturer-supplied conversion
> software behaves, but don't change the recorded pixel values directly.
Please be specific: does sharpening occur in the camera on RAW images?
(automatically or optionally)?
>
> You can also see when and where artifacts are introduced by trying
> different conversion software. If you don't have access to a full
> version of PhotoShop, PhotoShop Elements 3.0 includes Adobe Camera Raw
> (which can read DNG as well as the RAW format of many cameras).
I'll just use the OEM -> TIFF converter then continue in PS E 2.
Cheers,
Alan
--
-- r.p.e.35mm user resource: http/www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http/www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http/www.pbase.com/shootin
-- e-meil: there's no such thing as a FreeLunch.
John Francis wrote:
>>It may also, rather than specific sharpening, be artifacts of interpolating
>>seperate R,G,B sensors into RGB pixels that makes sharpening-like artifacts in
>>the RAW image.
>
>
> I think you may have a misunderstanding of just what a RAW image is.
> It is a direct measure of the sensor values, prior to any conversion
> to RGB pixels. Interpolation artifacts, etc., would be introduced
> during processing stages that take place later on in the chain, and
> so are not present in the RAW capture.
In any case, at some point the RAW image may converted to a "lossless" digital
format such as TIFF. In that conversion, regardless of where it takes place,
some artifacts of conversion are introduced. They hardly have a choice but to
be produced as interpolation (of whatever variety) to fill an RGB pixel from
spatially separated pixels must be imperfect.
>
> In general the only camera settings that affect the content of a RAW
> image are the effective ISO (maybe including exposure compensation),
> white balance (sometimes), and possibly the contrast. Other settings
> such as sharpening will be generally be recorded along with the data,
> and may very well affect the way the manufacturer-supplied conversion
> software behaves, but don't change the recorded pixel values directly.
Please be specific: does sharpening occur in the camera on RAW images?
(automatically or optionally)?
>
> You can also see when and where artifacts are introduced by trying
> different conversion software. If you don't have access to a full
> version of PhotoShop, PhotoShop Elements 3.0 includes Adobe Camera Raw
> (which can read DNG as well as the RAW format of many cameras).
I'll just use the OEM -> TIFF converter then continue in PS E 2.
Cheers,
Alan
--
-- r.p.e.35mm user resource: http/www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http/www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http/www.pbase.com/shootin
-- e-meil: there's no such thing as a FreeLunch.