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Forum: Pentax K-5 11-14-2012, 11:40 PM  
K5 RAW Preview Image is Desaturated/Overexposed, RAW Correct. WTF?
Posted By Epoch of Entropy
Replies: 15
Views: 2,828
I understand that, and knew that before getting in to what I was saying later (the original post alludes to this).

My following argument was that Pentax shouldn't alter the RAW JPG preview, and should have reserved these settings for JPG only exposures.

But the more I think about it, I can also understand why Pentax allows users to set the "auto develop" settings to affect the RAW preview, especially now understanding that some select software (anyone know which?) can read the auto develop settings. In a controlled environment or preference of artistic interpretation, (say someone who likes B/W high contrast) they may want to see the preview as a close(r) or final approximation of that development and have them wired in as a preference.

I think that I've changed my "wish" from wanting Pentax to disable this for RAW, to Pentax setting this as ACR settings when saving DNG files. :D
Forum: Pentax K-5 11-14-2012, 08:21 PM  
K5 RAW Preview Image is Desaturated/Overexposed, RAW Correct. WTF?
Posted By Epoch of Entropy
Replies: 15
Views: 2,828
Useful to know. Might be more useful if LR read it. ;)
Forum: Pentax K-5 11-14-2012, 08:20 PM  
K5 RAW Preview Image is Desaturated/Overexposed, RAW Correct. WTF?
Posted By Epoch of Entropy
Replies: 15
Views: 2,828
By default when first opening an image LR will first read the preview image in the RAW file for display, then opens the RAW and extracts enough information to generate a new preview image, which then LR gives preference to using and updates the display. It will then ignore the embedded preview image until the cache is purged. You can see this happen in real time by scrolling to images and watching them "pop" into the ACR profile.

AFTER that point, Lightroom then makes "Develop" adjustments to internal catalog preview (which is what I'm thinking you're saying) which was generated from the extracted RAW data, NOT the preview image embedded in the RAW file.

Note my description in the original post refers to before LR processes and after LR processes the embedded previews.
Forum: Pentax K-5 11-14-2012, 08:02 PM  
K5 RAW Preview Image is Desaturated/Overexposed, RAW Correct. WTF?
Posted By Epoch of Entropy
Replies: 15
Views: 2,828
OK, the issue is fixed. I must have somehow pressed the "Custom Image" button accidentally, and set the mode to "Bleach Bypass". This apparently affects the RAW preview... now that's *completely* counter-intuitive to me. I'm not sure I see ANY benefit to this functionality. One would think that even if you were shooting RAW+, this should only affect the JPG, but still show the RAW as is.

Do PEF files store these develop settings and show up in the Pentax RAW processing software with the "magic" already applied to the RAW?
Forum: Pentax K-5 11-14-2012, 07:43 PM  
K5 RAW Preview Image is Desaturated/Overexposed, RAW Correct. WTF?
Posted By Epoch of Entropy
Replies: 15
Views: 2,828
I have no JPG processing settings enabled for JPG record mode. Note that I'm shooting these files as RAW DNG.

Cross Bracketing: Off
Extended Bracketing: Off
Digital Filter: Off
HDR: Off

I've even turned the NR off!
Forum: Pentax K-5 11-14-2012, 07:35 PM  
K5 RAW Preview Image is Desaturated/Overexposed, RAW Correct. WTF?
Posted By Epoch of Entropy
Replies: 15
Views: 2,828
SOLVED! See here.

Guys, a weird issue started happening in just the three days. I'm actively taking photos every day, so I've noticed the abrupt transition when this started occurring. I want to point out that nothing has changed in my software; I haven't updated the camera firmware since September, and Lightroom or Photoshop hasn't updated in a long time. I haven't changed the process, any settings in the camera, no new lenses, etc etc in many months. Please note that I've owned this body since shortly after the K5 came out, so I'm not just "figuring this out".


What I'm seeing happen recently is that when taking a picture, in the camera's LCD preview, it appears undersaturated and very often looks like it's overexposed with a lack of color depth. When initially viewing the thumbnails in Lightroom, it pulls up the JPG from the RAW file and shows as the camera back LCD does, but when Lightroom finishes processing the thumbnails for the RAW file the image appears as I would expect; with rich colors and correct exposure.

At first I thought the aperture blades were sticking, but now that I've seen the RAW files being reprocessed by Lightroom, I believe that somehow the camera's JPG preview rendering function is torqued. Please see the following images which illustrate the issue more clearly.

I'm loathe to do a hard factory reset, as I have a number of USER mode settings and many of the buttons have been modified. I'd like to treat this as a last resort.


Some Information:
RAW Format: DNG
Color Space: AdobeRGB
LCD Color Tuning: 0 / 0

Lenses:
DA 40mm Limited
DA 15mm Limited
DA 70mm Limited

Before Lightroom Processes the Previews:


After Lightroom Processes the Previews:
Forum: Pentax K-5 08-06-2012, 07:25 PM  
Len release button finally fell off!
Posted By Epoch of Entropy
Replies: 34
Views: 5,069
I had the same problem recently, but unfortunately I lost the button at an unknown time while outdoors.

Any luck with installing the new button parts?
Forum: Pentax DSLR Discussion 06-30-2008, 04:54 PM  
Strange Haloing... Help me solve.
Posted By Epoch of Entropy
Replies: 16
Views: 3,458
I haven't tried with the Tamron yet, but I will soon.

I also didn't take the UV filter off the kit lens, which may be affecting things at larger apertures.

Any useful info and I will report back.

This is making me think that buying lenses from the local shop is good. Trying them out there and finding one that has the best performance. I'm sure these guys have stringent manufacturing tolerances though, so it might be a waste of time.
Forum: Pentax DSLR Discussion 06-30-2008, 03:42 PM  
Strange Haloing... Help me solve.
Posted By Epoch of Entropy
Replies: 16
Views: 3,458
A quick follow up:

I did some tests with the kit lens and high contrast subjects. At home I made some longish exposures of a dark item on a bright white table with incandescent lighting. I set up the camera on a tripod, set the exposure timer to 10secs (to eliminate wobble as the cause) I focused right on the edge of the subjects.

What I found was that at higher apertures, there was distinct haloing.

This was resolved at around F5.6 where it was barely perceptible. Using any smaller aperture and it disappeared almost completely.

I will attach 100% zooms of screens if anyone wants.
Forum: Pentax DSLR Discussion 06-27-2008, 09:17 AM  
Strange Haloing... Help me solve.
Posted By Epoch of Entropy
Replies: 16
Views: 3,458
I've got a Heliopan UV filter that I keep attached to the kit lens at all time. I was assured that this is some of the best glass filters you can get.



I want to setup a high-contrast test with the kit lens and my tamron 70-200, to see if it's the lenses. With the suggestion above, I will also test the kit lens with and without the filter.
Forum: Pentax DSLR Discussion 06-25-2008, 05:35 PM  
Strange Haloing... Help me solve.
Posted By Epoch of Entropy
Replies: 16
Views: 3,458
The kit lens. I'm not sure what version, but I bought it new last summer.
Forum: Pentax DSLR Discussion 06-25-2008, 05:19 PM  
Strange Haloing... Help me solve.
Posted By Epoch of Entropy
Replies: 16
Views: 3,458
No sharpening was on in the camera.

That's one of the first things I turned off when I got the K10. It was also shot in RAW (DNG) and no color correction routines applied. Basically every setting that assures what gets stuffed onto the SD Card is unaltered. (I prefer to leave it to Photoshop than the camera)

I just double checked, and ACR had sharpening "To all photos" on, which made a very slight difference in the hard edge on the Blue channel. Glad that's caught and out of the way now.
Forum: Pentax DSLR Discussion 06-25-2008, 04:55 PM  
Strange Haloing... Help me solve.
Posted By Epoch of Entropy
Replies: 16
Views: 3,458
I'm somewhat new to photography, but have found that in a few cases with my K10D that there's haloing around high-contrast edges.

What I'd like to know is:

How do I avoid this when I shoot the original photo? (or minimize it)

Are there any commonly used techniques to correct this in post?

Note attached image is slightly color corrected, and rotated to increase size. This is a 1:1 snapshot of a photo.

I've also shown two of the channels where it occurs the worst. Notice in both the Red and Blue channel there is a bright halo that extends from the outer edges of the ring inward. The Blue channel also has a very hard edge, which I thought was strange.

It's also slightly green on the bottom, and slightly red on the top. (remember the attachment is rotated). It even occurs in relatively lower contrast areas, which you can see in the edge of the far right ring.

Any advice would be greatly appreciated!

Thanks,

.:: Epoch
Forum: Photographic Technique 07-27-2007, 11:01 AM  
Correct procedure to change a lens to reduce dust
Posted By Epoch of Entropy
Replies: 26
Views: 6,583
Since a single large spec of dust can do a nice little diddy to the CCD, and the idea is to keep the most out, turning the camera facing down over time will help, especially if you're not particularly active with cleaning out the body.

Want proof? Take two similar glasses and duct tape them together, one facing up, one facing down. Take a piece of clear tape, loop it and stick it to the top of the jar. Take another piece of clear, loop it and stick it about 1-2" up inside the other jar.

Let them sit out for a few days, inside or outside. Gravity is not helping keep your camera dust free as much as it is helping keep you stuck to the ground.

While I'm not a camera professional, this just makes plain sense.
Forum: Photographic Technique 07-27-2007, 10:04 AM  
The RAW vs JPEG Debate
Posted By Epoch of Entropy
Replies: 80
Views: 15,252
Since I'd like to get a 13x19 printer sometime... This portion of the review was enough to convince me that RAW is the way to go. Scroll down to the side by side comparisons.

Pentax K10D Review: 16. Photographic tests: Digital Photography Review

Also, another reason why I got the K10D over the Canon or Nikon was because it shot straight to DNG, and I have high hopes for the format due to Adobe's presence in the marketplace.

Granted, if you were just putting the pictures in a digital frame, posting 1024x768 into a gallery, or printing 4x6 prints, would you notice? Probably not. Any other purpose probably would.
Forum: Pentax DSLR Discussion 07-26-2007, 11:19 AM  
Aperture Limitations In Manual Mode?
Posted By Epoch of Entropy
Replies: 6
Views: 1,935
I've come across this too as a new K10D and SLR owner, and was wondering about that.

Anyone have a link handy that explains this in a bit more detail?
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