Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-19-2013, 01:13 AM   #16
Loyal Site Supporter
drougge's Avatar

Join Date: Jan 2010
Location: Malmö
Photos: Gallery
Posts: 787
QuoteOriginally posted by Adam Quote
Yup, I guess the Q cameras don't compress their DNGs to speed up shooting speed (which is a good thing). All I'm saying is that raw files, like jpegs, can be compressed, just not in a lossy manner.
Given how slow the card controller in the Q is I'm not sure they really save time, even with the slow CPU. (No way to know unless they enable compression in a new firmware.) And even if they do I'd appreciate the option of smaller files.

But you're wrong about DNG, it does support lossy compression (using JPEG coding even). Introduced in version of the format, only allowed for LinearRaw 8 bit integer data. (The DNG idea of linear is kind of strange though, you can have a lookup table to make it as non-linear as you like.) (I'm ignoring the embedded JPEG images that have always been supported.)

09-24-2013, 07:55 PM   #17
ScooterMaxi Jim's Avatar

Join Date: Jul 2009
Location: Minnesota
Posts: 1,501
A few other observations regarding the JPEGs offered. Clearly, the MX-1 processing is showing some artifacts. DPreview has a policy to shoot studio scenes at default settings (apparently based on the assumption that its readers aren't likely to think for themselves to determine the most favorable settings). Not to say that the Q7 output is more pleasing, but processing (sharpening) could arrive at a more similar outcome. If you are trying to confirm the sensor similarity, take JPEG processed screenshots out of the equation and compare RAW. While I am not about to defend the 02 as the sharpest lens out there, based on my experience with that lens I seriously doubt it performs that poorly (even a bad sample). It does appear that the shot was out of focus (not an infrequent situation for DPreview).

I'm not saying one camera is better than the other, but I seriously doubt that their IQ performance could be that starkly different if all factors in the setup are otherwise equal. In fact, I doubt that the original Q / 02 (which I have) would be nearly as far behind the sharpness rendered by the MX-1 in studio.
09-25-2013, 02:46 AM   #18
Forum Member

Join Date: May 2011
Location: Marseille Provence
Photos: Albums
Posts: 61
Original Poster
Pentax Q7 vs MX-1 = same CMos / different DSP

QuoteOriginally posted by ScooterMaxi Jim Quote
... It does appear that the shot was Out Of Focus (not an infrequent situation for DPreview)...

better have a look at the DPReview Samples before Posting ?
see the RAW image from the Pentax Q7 is as Good & Sharp as the MX-1...
versus iso 800, 1600, 3200, etc... JPEGs are way too much Smoothed by the DSP !
=> the MX-1 High Iso OOC JPEGs are much better !

- Q7 left --- MX-1 right
- RAWs up --- JPEGs down
+ take a look at the JPEG-size :
MX-1 Jpg-size is 47% bigger than Q7 :

and exactly the same difference from the Imaging-Resource iso 3200 samples :

- I-R = MX-1 left / Q7 right
JPEG Size = 6 MB vs 3.5 MB !

Pentax Q7 vs MX-1 = same CMos / different DSP !
because it's a DSP issue... we can just hope a Firmware Update...
... for the Pentax Q7 to reach the MX-1 OOC IQ !

wait & see...

Last edited by geo444; 09-25-2013 at 02:56 AM.
09-25-2013, 04:56 AM   #19
Site Supporter

Join Date: Jul 2012
Location: Greater Montreal Area
Posts: 736
Another good reason to shoot raw, isn't it?


  • 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, dpr, image, jpeg, mirrorless, pentax q, pentax q10, pentax q7, q10, q7, quality, size, test, vs
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Q vs. MX-1 - Same sensor? 6BQ5 Pentax Mirrorless Cameras 5 08-07-2013 03:57 PM
Canon G15 vs. Pentax MX-1 Amoon Pentax Compact Cameras 4 04-03-2013 06:26 PM
PENTAX MX-1 HIGH-END DIGITAL COMPACT WINS PRESTIGIOUS 2013 DESIGN AWARD MX-1 Receives Adam Homepage & Official Pentax News 6 03-21-2013 09:58 PM
DXO Tests MX-1, Same Results as Q PenTX Pentax Q 4 03-02-2013 05:44 AM
K-01 use the same CMOS of X-PRO 1? yipchunyu Pentax K-01 5 02-24-2012 03:53 PM

All times are GMT -7. The time now is 02:20 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]