>
>> It's becoming obvious that the trick to using glass filters is to
>>record the image as RAW colour, convert it to JPEG colour, and then B&W.
>>Or something like that. I find that doing this processing with the camera
>>is a bit cumbersome as I have a lim ited opportunity to judge the
>>saturation, etc. before doing the conversions.
>
>It gets a little more complicated. Yes, LR is a good option, but the
>problem comes in that there is an inherent flaw in the way nearly all
>raw converters combine the three or four pixels together to get a
>merged RGB value for the pixel. When one set of sensels has a full
>luminance range of values, but the other sensels don't there is an
>averaging that kicks in which screws everything up.
>
I did download the LR demo file, which took about 1 1/2 hours with the
WiFi connection. Immediately afterwards I had all sortsd of trouble moving the
file to another folder or copying it to the external drive for archiving. I
looked at the Task Manager and saw that my antivirus was working triple
overtime. I came home, restarted the machine, and all worked fine. Fine, that
is, until I tried to run the antivirus, which seemed to hang up.
So, I restarted the machine in Safe Mode and the antivirus launched
properly. It now seems that while I was downloading the LR demo a hacker
entered the coffee shop and my antivirus was diligently fighting him off. So,
I'm running the antivirus and later the malware to clean things up.
In the meantime, I happened to recall that inside the rear cover of
"Filter Practice" by Clauss & Meusel (Focal Press,1964) there is a colour test
card for evaluating the performance of B&W filters. Since this is the
definitive test, I'm going to set this up tomorrow morning when the outside
temperature is more agreeable (it's presently 104F at 1100) and do a full test
of the emulated filters in both JPEG B&W and RAW B&W (no B&W conversion from
colour). Afterwards I'll do a similar test with glass filters, then later do a
test with colur images converted to B&W.
You can tell that I am determined to understand this.
The nice thing about bicycles, slide rules, carbeurators, and manual film
cameras is that they are totally immune from viruses.
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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