I also want to understand why I don't get any hot pixels when I use the Photoshop CS raw converter and create a tiff file that way. Perhaps I need to tweak the settings.
On Mon, 2004-03-15 at 10:40, Dr. Shaun Canning wrote: > Hi Frits, > > It seems like the hot pixel phenomena are pretty widespread, but then some dont seem > to have any at all. It will be interesting to > see what the 'average' number of hot pixels is amongst those who submitted results > to Rob. > > Cheers > > Shaun > > Dr. Shaun Canning > Cultural Heritage Services > Lawrence Way, Karratha, > Western Australia, 6714 > Mob: 0414-967 644 > > [EMAIL PROTECTED] > www.heritageservices.com.au > > > > -----Original Message----- > From: Frits Wüthrich [mailto:[EMAIL PROTECTED] > Sent: Monday, 15 March 2004 7:37 AM > To: [EMAIL PROTECTED] > Subject: Re: *ist D Pixel Comparison Test > > I ran this test using a TIF file, which is recommended, as a jpg might > cause false reporting on hot pixels which are artifacts of jpg > compression. > When shooting RAW and using the converter of Photoshop CS to create a > TIFF, I didn't find any hot pixels. > With TIF writing by the camera on the flash card directly however, I did > find hot pixels, no dead ones. I did the test with Noise Reduction (NR) > on and NR off. > > NR off NR on > 30 s 834 3 > 15 s 82 5 > 8 s 31 0 > 4 s 25 0 > 2 s 15 0 > 1 s 17 0 > 1/2 s 11 0 > 1/4 s 5 0 > 1/8 s 2 2 > same results up to and including 1/4000 s (2 hot pixels with NR off and > NR on). > > On Sun, 2004-03-14 at 00:39, Dr. Shaun Canning wrote: > > Hi guys, > > > > Anyone willing too take part in a little experiment with your *ist D? I know how > > you guys all love comparing lenses and gear from > > time to time, so hopefully a few of you might help me out. > > > > I want to compare the number of recorded 'hot' pixels with other owners to see if > > the results I got from testing are normal or > > otherwise. It'll take about 3/4 of an hour to run the tests the same way I did. > > > > I used a little utility called 'Dead Pixel Test' which is available at > > http://www.starzen.com/imaging/deadpixeltest.htm > > > > I took a series of shots with the following set-up. > > > > 1. Lens cap on > > 2. Viewfinder cap on > > 3. Manual mode > > 4. Manual Focus > > 5. JPEG Highest Quality > > 6. F8.0 using FA 24mm (not that the lens should really matter) > > 7. Noise reduction On > > > > I took frames with shutter speeds ranging from 1/4000 down to 2 seconds (all > > speeds in between). I then used the Pentax Photo > > Browser to export a *.csv worksheet to work on in excel. Then I ran each frame > > through the test program, as per the instructions. > I > > set the Luminance threshold to 60, and the Dead Pixel threshold to 100. > > > > Thankfully, I recorded no dead pixels, and the worst result was a total of 4 'hot' > > pixels at 1/8 and 1/6 sec. noise reduction does > > cut in at 1/4 sec, eliminating all 'hot' pixel occurrences from 1/4 too 2 secs. > > > > As other have pointed out, some of the images I uploaded yesterday definitely > > display hot-spots caused by these 'hot' pixels. What > I > > am interested in is the results that anyone else may get to compare to my camera. > > > > Thanks in advance, > > > > Shaun > > > > Dr. Shaun Canning > > Cultural Heritage Services > > Lawrence Way, Karratha, > > Western Australia, 6714 > > Mob: 0414-967 644 > > > > [EMAIL PROTECTED] > > www.heritageservices.com.au > > > > > > > > -----Original Message----- > > From: Dr. Shaun Canning [mailto:[EMAIL PROTECTED] > > Sent: Sunday, 14 March 2004 6:37 AM > > To: [EMAIL PROTECTED] > > Subject: RE: *ist D Photos > > > > Thanks Mark. I would have liked the 'in flight' shot to be a bit sharper, but you > > know how fast these little buggers move. It was > > more luck than good management. I'm pretty happy with the overall performance of > > the *ist D though, even if I do have a couple of > > 'hot' pixels. > > > > Cheers > > > > Shaun > > > > Dr. Shaun Canning > > Cultural Heritage Services > > Lawrence Way, Karratha, > > Western Australia, 6714 > > Mob: 0414-967 644 > > > > [EMAIL PROTECTED] > > www.heritageservices.com.au > > > > > > > > -----Original Message----- > > From: Mark Cassino [mailto:[EMAIL PROTECTED] > > Sent: Sunday, 14 March 2004 2:54 AM > > To: [EMAIL PROTECTED] > > Subject: Re: *ist D Photos > > > > Cool photos, especially the dragonflies in flight. > > > > I was wondering how the *ist-D would do with bugs - looks great! (Mine > > arrived with the first snow, so no chance to test it on insects yet). > > > > - MCC > > > > At 12:41 PM 3/13/2004 +0800, you wrote: > > > > >Hi gang, > > > > > >Here are the results of my first foray into the bush with an *ist D. all of > > >the shots were taken with the *ist D, battery grip, FA 100mm macro. All were > > >handheld. Photoshop work was limited to sharpening and adjusting the levels > > >a bit. > > > > > >The files are all in the 1-3 mb range, so be warned, they'll take a while to > > >come down the pipe via a 56k modem. None of them are resized. > > > > > >http://www.heritageservices.com.au/Pentax%20ist%20D%20Photos/Web%20Gallery/i > > >ndex.htm > > > > > >Tell me what you think? > > > > > >Cheers > > > > > >Shaun > > > > > >Dr. Shaun Canning > > >Cultural Heritage Services > > >Lawrence Way, Karratha, > > >Western Australia, 6714 > > >Mob: 0414-967 644 > > > > > >[EMAIL PROTECTED] > > >www.heritageservices.com.au > > > > ----- > > > > Mark Cassino Photography > > > > Kalamazoo, MI > > > > http://www.markcassino.com > > > > ----- > > > > > > > > > > -- Frits Wüthrich <[EMAIL PROTECTED]>
