Re: [APML] M8 using a Canon D60 digital SLR

["Mike Unsold" <mike@mlunsold.com>]

Hi Bill

My understanding of the Raw Image Converter's linear mode is exactly as you
stated. I have not yet been able to verify this from any Canon technical
specs but the raw 48-bit TIF images coming out of Raw Image Converter look
very much like an image from a cooled linear CCD. I am looking for a
technical description of Raw Image Converter from Canon but have not found
one yet. If anyone does please post it!

I always take 9 dark frames using the same temperature, exposure, and ISO
setting as the raw images and average them to make a master dark frame. Each
raw 3072x2048 48-bit TIF image from Raw Image Converter is dark frame
calibrated before being aligned using a semi-automatic correlation algorithm
that is accurate to 0.10 pixel. The averaged or summed combination is also a
3072x2048 48-bit TIF and is saved before further processing.

Mike

----- Original Message -----
From: "S y z y g y" <syzygy@vnet.net>
To: <astro-photo@seds.org>
Sent: Tuesday, July 16, 2002 9:00 AM
Subject: Re: [APML] M8 using a Canon D60 digital SLR


> Mike,
>
> Great image.  I have been waiting for a clear night to try out my D-60
> on my Traveler.  I haven't even had a chance to try it on the Moon!
> You'd think with all the clouds we also wouldn't be in a drought...
>
> What is your understanding about the "linear mode" in the Raw Image
> Converter?  Do I assume correctly that the "standard" or non-linear
> mode implies a normal film response curve that has a flat, horizontal
> part, then a knee where the film density rises, and then the curve
> flattens out (slope=zero) again as the film is saturated?  If so, then
> should I assume that the "linear" mode means that we have a straight
> line plot where intensity is proportional to exposure until it
> saturates?
>
> Do you know where some of these technical specs can be found for the
> D-60?
>
> Are you only using dark frames?
>
> - Bill
>
>
> ----- Original Message -----
> From: Mike Unsold <mike@mlunsold.com>
> To: <astro-photo@seds.org>
> Sent: Tuesday, July 16, 2002 7:57 AM
> Subject: [APML] M8 using a Canon D60 digital SLR
>
>
> | Hi
> |
> | This version of M8 is a 3 minute exposure at ISO 400 using a Canon
> | D60 and C14 at F7. Processing details are included with the image.
> No
> | color enhancement was done on the image so the colors are pretty
> | much as recorded by Canon's 12-bit raw mode and converted to TIF
> using
> | linear mode only. White balance was set to auto.
> |
> | http://www.mlunsold.com/examples/D60/D60-M8.html
> |
> | Comments are welcome.
> |
> | Have a good day.
> |
> | Mike
> |
> |
> |
> |
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