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JPEG Quantization Table Lookup

Lookup a DQT / Quantization Matrix / JPEG Compression Quality tables for Digital Cameras and Digital Photography Software.

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Background Information

For information on how to interpret this data, please read about JPEG quantization tables.


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 Similar conversations are going on about the sony Alpha veusrs Nikon. Both use the same sensor (Sony CMOS) and front filter. But the Nikon circuitry is different and appears to have some inbuilt noise reduction, ignoring any post processing. The other side is that the Sony appears tp out perform the Nikon on resolution and if using RAW images and post processing on your PC can produce pictures with greater detail showing less noise than the Nikon. Back in the real world the difference in hardware isn't going to make a difference to my Ansel Adam's like photographic elite skills. But for the rest of you mere mortals the hardware obviously makes all the difference.
 I was interested in the cemomnt that shooting in RAW + Jpeg led to the RAW files largely getting forgotten about because it was too time consuming to do the individual processing. That's such a statement of reality, I was overwhelmed.
2014-05-23Sepide Azarian
Is there any MATLAB command to get access these information? specially the quantization table.
I wanna use this table for a database of different quality picture.
 Hello Sepide -- I don't use MATLAB myself, but I see that someone has posted some code to do this extraction to this thread. Good luck!
2013-11-12Phil S.
 Yes, in some cases Photoshop's quantization tables depend on image size.
 Your simple point and shoot carmea IS an actual carmea for photography. What you are referring to is wanting a DSLR which gives you more options and control.You can look into any carmea in the Canon Rebel series or the Nikon D3100 or Nikon D5100. All of them are quality entry level carmeas for new DSLR users who want to learn but don't want to be overwhelmed. They typically range in price from $ 500-900 depending on what you get and whether a kit lens is included with it.
2013-04-10chen chao
 there is another luminance table for when Photoshop QF is 12

1 1 1 1 2 2 2 3
1 1 1 1 1 2 2 3
1 1 1 1 2 3 4 5
1 1 1 2 3 4 5 7
2 1 2 3 4 5 7 8
2 2 3 4 5 7 8 8
2 2 4 5 7 8 8 8
3 3 5 7 8 8 8 8
2013-04-10chen chao
 As we know, Photoshop uses 2 different tables for different pictures when the quality Factor is between 3 and 12.
 and an image you can tinker about with (RAW) on your ceupmtor until it is perfect (the provided Canon software makes it very easy to do). Navigating around the camera menu becomes a breezes after a few practices, although keep the manual nearby as there is a wealth of information to digest from it. The screen on the back is fantastic and crystal clear. The camera feels comfortable to hold (even in my big paws!) and is not to heavy to cart around. The microphone port is also a welcome new addition as it will allow you to capture the sound in stereo and enables you to choose your microphone weapon of your choice rather than being condemned into using the built in microphone (which does the job). The only moan about this kit is that the AF is bit noisey, as it's not a USM lens, but if you want a comparable zoom range in a Canon USM lens you'd be paying a hell of lot more money (eg the 15-85 IS USM). A couple of tips before I go 1) Buy a decent SDHC card like a Sandisk Extreme with a class 10 rating, preferably 16GB or more (for the video capture side of things especially). Don't be lured into buying a cheap card because it has a high capacity as it won't read and write the data fast enough to be of any good, especially the HD video. Canon recommend at least a class 6 card. 2) Get a powerful ceupmtor. I am going to upgrade my desktop PC (or get something else). It has a 3.4Ghz AMD processor (albeit 5 years old), 1GB RAM and 256MB graphics, running with Windows XP. It can't seem to handle displaying the captured HD video and is slightly slow in processing the RAW images (each of which can be around 24MB in file size). Overall a top piece of kit that you won't be disappointed with.


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