MattMatic

Joined: 2nd July 2002

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MattMatic
You never know - it might be missing pentaprism/mirror, mirror box, and possibly even a mechanical shutter

How about just go straight for "LiveView" on LCD like a pocket digicam? Depending on the sensor technology used they could make it so it has an electronic shutter (ie CMOS that has the shutter speed dictated by electronics rather than a focal-plane shutter).

Metering and focus would, of course, have to be like digicams and taken off the sensor. It would save a lot of expensive mechanical parts though, and may well appeal to the advanced digicam users

Matt

Comment by MattMatic posted on New Pentax camera? at 14/04/2009 - 16:28

MattMatic
Can you show (or email) a JPG of the image you are talking about?
The embedded EXIF information will tell me a lot about what you are doing (or not doing)

Matt

Comment by MattMatic posted on Fill Flash on a K20D at 14/04/2009 - 16:00

MattMatic
Andrew - How long is long?
Matt

Comment by MattMatic posted on A PC for RAW at 14/04/2009 - 15:59

MattMatic
I spend my working days writing firmware for data storage into NAND Flash devices. The endurance cycle of NAND flash (which is what SD/SDHC cards are) are typically 100,000 erase/write cycles - but that's worst case conditions. Generally the firmware adds EC (error correction) to that, so that even when single bits fail they can be mathematically reconstituted.

Data retention is spec'd at 10 years (ie it'll hold the data for a minimum of ten years without power etc).


Personally I format in-camera after I've copied the data to 3 hard drives. (But I actually cycle three 4Gb SDHC Extreme III cards, and only format when I insert into the camera to actually use the card.)

Matt

Comment by MattMatic posted on SD & SDHC maintenance at 14/04/2009 - 12:55

MattMatic
This gets more interesting...
I created a 16 step black to white and first saved as a TIFF in sRGB. Loaded into various applications to see what the result would be. I get one of two results: either the first 4 shadows are all black, or I can see all steps. There are three possibilities as far as I can tell:
* No colour management - shows 16 steps
* Colour management - shadows black (with CM but no BPC)
* Colour management - shows 16 steps with CM and BPC.
This is how I see it at the moment...


Silkypix - with CM - shadows black.

CaptureOne 4 - with CM - shadows black.

LightRoom - not sure if it is CM aware (!!). There's no choice of which ICM profile to choose, but displays correctly.

IrfanView - not CM aware, but displays "correctly"

Firefox with CM as a TIFF - shows though QuickTime. Looks "correct", probably because QT is rendering with no CM.

Firefox with CM as a JPG - shadows black (FF is certainly rendering this through its own CM).



No wonder this laptop has been puzzling!!!
Also goes to show there's a difference between calibration and profiling

Matt

Comment by MattMatic posted on Basic Colour Management: C1 & PS at 12/04/2009 - 07:15

MattMatic
Just thought I'd add an extra piece of information... black point compensation.

Having had troubles with my laptop LCD I found that it displays shadows rather badly - in the ephotozine test strip (at the bottom of the page) I could only discern perhaps the fourth black step. The darkest three are all pitch black.

This is with a properly calibrated and profiled LCD!

This led me to read some more on ArgyllCMS, plus some extra research. Turns out that Photoshop uses BPC (Black Point Compensation) by default. When edited in PS everything looks fine (unless you soft proof). Adobe effectively apply an adjustment to the display that makes all shadows, midtones, and highlights visible

BUT, not all applications apply BPC. Silkypix certainly doesn't, even with a profile applied. So getting shadows right is difficult in SPDS3 for me (with my bad LCD).

Adobe Lightroom does apply BPC (being Adobe).

Not sure about other apps....

So, if you're having issues with images displaying differently in colour managed applications - this may be at least part of the problem

Some information from Adobe here: http://www.color.org/AdobeBPC.pdf

Matt

Comment by MattMatic posted on Basic Colour Management: C1 & PS at 11/04/2009 - 22:31

MattMatic
Aha! I didn't have Flash 10 installed and Firefox just showed nothing at all. Nada. Diddly squat.

Reckon you need some Javascript to check the currently installed Flash version and show an appropriate dialog box. (Or it could be Flashblock on FF - but normally that lets me see something!)

Opened in IE and the first image was bigger than the holding frame - eek! And then tried to view the galleries and the Flash upgrade dialog appeared.

Something tells me you need to do more testing on multiple browsers At work we check every main browser (Opera, Safari, FF, IE, Netscape, Chrome, etc) and there's always one that doesn't play ball

Matt

Comment by MattMatic posted on New Website, comments etc appreciated at 11/04/2009 - 20:11

MattMatic
Sorry to hear about your news
All the best.
Matt

Comment by MattMatic posted on Leave of abcense at 11/04/2009 - 12:24

MattMatic
Can't see anything at all here
I click on a heading... and an odd graphic appears and nothing else.
If I click on "About" or "Contact" then the messages appear though.
The choice of "Times New Roman" font is a bit hmmmm
Matt

Comment by MattMatic posted on New Website, comments etc appreciated at 10/04/2009 - 22:22

MattMatic
Thanks Jason

Comment by MattMatic posted on Matt Matic's Pentax dSLR Flash Guide at 10/04/2009 - 20:47

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