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Playmemories query

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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Topic: Playmemories query
    Posted: 01 March 2021 at 22:32
I don't know if anyone else uses it, but I've noticed something odd in Sony Playmemories. Taking jpegs in extra-fine on the A7Rii they are around 25-30Mb each, but if I make any slight change in edit and re-save, they come down to half that size. I can't see any obvious difference in the image even at 100% zoom, so what is happening?
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
 



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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 03 March 2021 at 08:09
What is de JPG compression setting? I do not use Playmemories, but with Paint Shop pro you can set the JPG compression.
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 03 March 2021 at 08:32
It's probably different jpg compression settings. I've been hard pressed to see the difference between fine and extra fine from the camera (except for the file size).

It's probably after opening/editing/resaving multiple times that slowly quality differences start creeping in.
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 03 March 2021 at 12:40
Originally posted by pegelli pegelli wrote:

It's probably different jpg compression settings. I've been hard pressed to see the difference between fine and extra fine from the camera (except for the file size).

It's probably after opening/editing/resaving multiple times that slowly quality differences start creeping in.

Yes, I thought that. I was surprised to see how bug the jpeg files were, so I'll probably go back to fine.
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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gigo View Drop Down
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 03 March 2021 at 13:05
Keywords around here may be helpful.
"guetzli"
"butteraugli"
"Mozjpeg"
Generally, when JPEG is compressed by hardware, the Huffman table is fixed and not optimized, so it tends to be larger than software.
Also, this is trivia, but it is convenient if the image size is a multiple of 8. For example, lossless rotation is possible.

There are two other types of JPEG compression for Alpha series cameras.
TYPE 6 --JPEG (old)
TYPE 7 --JPEG
Does anyone know the details?
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ILCE-QX1, Full Sprctrum NEX-5R, E:2
LA-EA5, A:35G/100S/200M/500R,3x-1x +7, SIGMA MC-11 + Canon EF8-15 FishEye
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