Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-17-2015, 05:31 PM   #16
Site Supporter
Site Supporter
paulh's Avatar

Join Date: Sep 2010
Location: DFW Texas/Ventura County, CA
Photos: Gallery | Albums
Posts: 33,010
QuoteOriginally posted by Transit Quote
googledrive might not be an option, 15GB free and the RAW is 20...
20 gb or 20 mb? 😊

04-17-2015, 05:34 PM   #17
New Member




Join Date: Jun 2014
Posts: 10
RAW files don't get that big. It's probably megabytes.
04-17-2015, 06:00 PM   #18
Pentaxian
Sagitta's Avatar

Join Date: Feb 2011
Location: Maine
Photos: Gallery
Posts: 3,081
The RAW files would be carrying the data in the embedded JPG your camera created along with it. This probably isn't a software error on your PC, its almost certainly a setting (or a glitch) on your camera.

Probably.

I'd try resetting the camera back to its default settings, snap a shot off, and see if it fixes the issue.
04-17-2015, 08:07 PM   #19
Pentaxian
Transit's Avatar

Join Date: Aug 2007
Location: Whanganui NZ
Photos: Gallery | Albums
Posts: 4,624
Original Poster
QuoteOriginally posted by paulh Quote
20 gb or 20 mb? 😊
ah yes...doh

---------- Post added 04-18-15 at 03:10 PM ----------

QuoteOriginally posted by Sagitta Quote
The RAW files would be carrying the data in the embedded JPG your camera created along with it. This probably isn't a software error on your PC, its almost certainly a setting (or a glitch) on your camera.

Probably.
yep I couldn't see it being the pc when 2 progs did it

QuoteOriginally posted by Sagitta Quote
I'd try resetting the camera back to its default settings, snap a shot off, and see if it fixes the issue.
ok will do thx

04-18-2015, 06:50 PM   #20
New Member




Join Date: Jun 2014
Posts: 10
Camera settings don't affect raw (apart from ISO setting), and if (as OP stated) "shots look correctly exposed ... in thumbnails and the jpg ... is good" - while the raw looks blown out, the problem is with raw interpretation; that is, the problem lies with the converters, not with the camera. A camera reset should not help here.

To OP: if you are still experiencing the problem, it would be helpful to make raw files available for analysis (sorry, repeating myself

Both programs are based on dcraw, so they may behave in a similar manner
04-19-2015, 01:54 AM   #21
Junior Member




Join Date: Sep 2012
Location: Bratislava
Photos: Albums
Posts: 44
For OP: If you are still unable to upload RAW, try to download someone's from the forum and see what happens. (For example from the post-processing challenge)
04-19-2015, 04:10 AM   #22
Pentaxian
Transit's Avatar

Join Date: Aug 2007
Location: Whanganui NZ
Photos: Gallery | Albums
Posts: 4,624
Original Poster
QuoteOriginally posted by kenny47 Quote
For OP: If you are still unable to upload RAW, try to download someone's from the forum and see what happens. (For example from the post-processing challenge)
great idea to d/l a RAW from here and have a squiz
onto it tomorrow

Pete

---------- Post added 04-19-15 at 11:15 PM ----------

QuoteOriginally posted by TheGoldbloom Quote
Camera settings don't affect raw (apart from ISO setting), and if (as OP stated) "shots look correctly exposed ... in thumbnails and the jpg ... is good" - while the raw looks blown out, the problem is with raw interpretation; that is, the problem lies with the converters, not with the camera. A camera reset should not help here.

To OP: if you are still experiencing the problem, it would be helpful to make raw files available for analysis (sorry, repeating myself

Both programs are based on dcraw, so they may behave in a similar manner
Thanks for your patience with my classic withholding of evidence
weekend got in the way as it does
I reset camera ( goodness do ppl use the focus beep much ) and as predicted it didn't help
give us while and I'll do the googledrive thing


Last edited by Transit; 04-19-2015 at 04:16 AM.
04-19-2015, 05:54 AM   #23
New Member




Join Date: Oct 2014
Posts: 4
Make sure both highlight and shadow correction are switched off. If the exposure of the RAW images and JPGs don't match this can be the cause - it was on my K-30.
Although the corrections shouldn't affect the RAW images they certainly affect both the actual JPGs and the embedded JPGs you see on the rear screen when shooting RAW only.
An overexposed RAW image can appear correctly or underexposed when looking at the 'corrected' JPG and vice versa.
04-19-2015, 09:53 AM   #24
New Member




Join Date: Jun 2014
Posts: 10
QuoteOriginally posted by infocus Quote
If the exposure of the RAW images and JPGs don't match...
Question. The RAW file and the JPG come from the same exact shot...how on earth could they have different exposures?
04-19-2015, 12:25 PM   #25
New Member




Join Date: Oct 2014
Posts: 4
Exposure in the sense of the apparent exposure i.e if the image looks under or overexposed. The actual exposure is the same for both.

I believe highlight correction changes the set exposure, underexposing the image by 1EV (so in that sense it does affect the RAW image) and then brightens the JPG. This process can sometimes give unexpected results and may cause a significant difference in the apparent exposure of the RAW and JPG images. Another problem is when the user then dials in some EV compensation based on reviewing the embedded jpg on the rear screen only to find at a later date that the RAW file actually required a different or opposite adjustment.
04-19-2015, 01:50 PM   #26
New Member




Join Date: Jun 2014
Posts: 10
QuoteOriginally posted by infocus Quote
Exposure in the sense of the apparent exposure i.e if the image looks under or overexposed. The actual exposure is the same for both.

I believe highlight correction changes the set exposure, underexposing the image by 1EV (so in that sense it does affect the RAW image) and then brightens the JPG. This process can sometimes give unexpected results and may cause a significant difference in the apparent exposure of the RAW and JPG images. Another problem is when the user then dials in some EV compensation based on reviewing the embedded jpg on the rear screen only to find at a later date that the RAW file actually required a different or opposite adjustment.
What you're talking about is called brightness. In the case of RAW, it has nothing to do with exposure. RAW data has no brightness, only levels; it is open to interpretation, as it is a latent image and can be rendered with arbitrary brightness and contrast. The use of term exposure instead of brightness results in nothing but confusion.
04-19-2015, 07:45 PM   #27
Pentaxian
Transit's Avatar

Join Date: Aug 2007
Location: Whanganui NZ
Photos: Gallery | Albums
Posts: 4,624
Original Poster
QuoteOriginally posted by kenny47 Quote
Are you using Neutral profile in Rawtherapee?
yes,
excuse my late reply.
only surpased by the lateness of images in question
hang on
04-20-2015, 01:14 AM   #28
Pentaxian
Transit's Avatar

Join Date: Aug 2007
Location: Whanganui NZ
Photos: Gallery | Albums
Posts: 4,624
Original Poster
ok finally here is a RAW
centre weighted average, TAv. -0.3
https://drive.google.com/file/d/0B7h3EhvmCU5KZV9qQTN2bm16RTA/view?usp=sharing

and here is the jpeg, as delivered by the camera, natural, highlight and shadow correction off

https://drive.google.com/file/d/0B7h3EhvmCU5Ka0xVc1hTQU5CUlk/view?usp=sharing

probably not a great example with the wet reflection
Thanks
Pete

---------- Post added 04-20-15 at 08:24 PM ----------

These two are a better indication
RAW https://drive.google.com/file/d/0B7h3EhvmCU5KUzFMZlJ4T1pTdm8/view?usp=sharing
JPEG https://drive.google.com/file/d/0B7h3EhvmCU5Kdmp0MDZXcE52Rkk/view?usp=sharing
04-20-2015, 05:19 AM   #29
Senior Member




Join Date: Jul 2012
Location: Trondheim
Posts: 237
Too me it looks like it is the other way around. The Jpeg seems underexposed and very contrasty.


Neither contains highlight clipping on my screen.


The raw files seems to have correct exposure in my oppinion.


Edit: Slightly weird. The google DNG preview seems to add +1 in exposure compared to when i open it in PS (CC 2014)


Added the histogram of the image when opened in Camera RAW.
Attached Images
 
04-20-2015, 07:17 AM   #30
Pentaxian
Sagitta's Avatar

Join Date: Feb 2011
Location: Maine
Photos: Gallery
Posts: 3,081
QuoteOriginally posted by timcatn Quote
Too me it looks like it is the other way around. The Jpeg seems underexposed and very contrasty.


Neither contains highlight clipping on my screen.


The raw files seems to have correct exposure in my oppinion.


Edit: Slightly weird. The google DNG preview seems to add +1 in exposure compared to when i open it in PS (CC 2014)


Added the histogram of the image when opened in Camera RAW.
I downloaded the RAW and opened it in PS - my histogram is different then yours for some reason pre-fiddling with it.

If anything the RAW is slightly (very very slightly) underexposed if anything.

I'm wondering if you maybe have some sort of autoexposure thing going on with your previews? Not familiar with your software so this is a wild guess, but could the previews be looking at one specific (and dark) point in the RAW image and exposing for that rather than the overall image? It almost sounds like what happens when you forget to turn off the single point exposure setting on your camera then start shooting shadows - everything blows out because the camera is exposing for that one single point rather than taking the entire shot into consideration.
Attached Images
 
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, drive, files, google, issue, jpeg, op, pc, pentax, pentax help, photography, post, reset, rt, settings, software, thanks, troubleshooting, upload
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aren't you glad you didn't have to photograph that? (post-mortem photography) ASheffield General Talk 43 11-11-2018 06:53 AM
view RAW thumbnail on windows 7? Nass Digital Processing, Software, and Printing 24 03-08-2012 10:26 AM
Raw vs jpgs Tony3d Pentax DSLR Discussion 4 10-31-2010 01:35 AM
[K10D RAW+]Exposure difference between RAW and JPEG sterretje Pentax DSLR Discussion 9 04-13-2010 02:06 AM
RAW Thumbnail viewer for Vista 64? ViS Photographic Technique 3 11-08-2008 04:01 PM



All times are GMT -7. The time now is 11:38 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top