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    redcode- amazingly good?!
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    This is bothering me because the .tiffs on the CML site show that Redcode is very very transparency. For 99.99% of the image, the compression is visually lossless (even if you zoom in 200%). The same cannot be said about 4:2:2 Y'CbCr (with no other compression), Cineform (no offence), DV's 5:1 DCT compression (or DVCPRO HD, HDCAM).

    This begs the questions:
    -Am I (not) seeing things?
    -How does Redcode achieve such results?

    My methodology:
    Superimpose the images in Photoshop.
    Set composite mode to difference.
    Use the levels adjustment layer, drag the right slider to the left.
    Make a new layer
    Hit alt crtl shift E to merge visible to new layer.
    Use that layer to help guide you to where the artifacts are.

    Disable the layer, just compare the uncompressed versus compressed versions.
    Zoom in if necessary (although this doesn't necessarily count, since real world viewers can't zoom in).

    To compare to other codecs, take the uncompressed TIFF and encode that with the other codecs. The comparison may be slightly unfair, since Redcode can optimize itself for Red images (RAW space; it also knows the sensor characteristics).
    Nevertheless, the Redcode images look much better than some of the other compression schemes out there. 8:1~9:1 in other schemes may be roughly equivalent to Redcode's compression (by 8:1, I am referring to a 8-bit RGB original compared to the 8-bit RGB compressed version in these other codecs).
    Last edited by glenn chan; 11-22-2006 at 11:39 PM.


     

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    LucernaStudios.com
    #2
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    Red Will Surprise Us
    I Can Feel It.
    Can Be Good Or Bad News!
    MMR


     

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    #3
    Senior Member evinsky's Avatar
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    Welcome to Redcode, can I get you another glass of coolaid?
    Always beg forgiveness, not permission! http://www.evingrant.com http://www.evingrantdp.com http://www.evingrantphoto.com
    RED #199
    HVX #69


     

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    #4
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    Ok, well it seems that JPEG (exported out of Photoshop) at 100% quality may arguably do a better job. I'm unsure about my methodology since it may be comparing apples to oranges.

    Nonetheless, I'm still impressed. And it's virtually visually lossless anyways, so there's not much more to be gained.


     

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    #5
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    Quote Originally Posted by glenn chan
    Ok, well it seems that JPEG (exported out of Photoshop) at 100% quality may arguably do a better job. I'm unsure about my methodology since it may be comparing apples to oranges.

    Nonetheless, I'm still impressed. And it's virtually visually lossless anyways, so there's not much more to be gained.
    your jpeg is only 8 bit.


     

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    #6
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    I'm sorry Glenn, should I reduce the quality of REDCODE so you can see the artifacts more easily :-) How does it work - it works like this:

    Pixels get transformed into Pixies. The Pixies are magic. We don't feed the Pixies, and with this crash diet, they loose weight. Now they're smaller, they fit into a smaller space. Once we get the Pixies into the computer to decompress them, we feed them lots of nice heavy electrons, they gain weight rapidly, and we turn them back into pixels for display on screen.
    www.nattress.com - Film Effects and Standards Conversion for FCP
    www.red.com - RED - 4k Digital Cinema Camera


     

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    #7
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    Graeme, you may be forgetting that this is a public forum. Now your competitors will know your secret technique and be able to copy you.
    "My subject matter always is and was just looking at people the way they are." - Mike Leigh


     

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    #8
    Member pywl's Avatar
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    Quote Originally Posted by Graeme_Nattress
    Pixels get transformed into Pixies. The Pixies are magic. We don't feed the Pixies, and with this crash diet, they loose weight. Now they're smaller, they fit into a smaller space. Once we get the Pixies into the computer to decompress them, we feed them lots of nice heavy electrons, they gain weight rapidly, and we turn them back into pixels for display on screen.
    Lol, I felt like I was reading a bed time story.

    Once upon a time in a magical Pixie land, the evil Graeme captured and inslaved a bunch of lovely sweet little pixies. The evil Graeme then starved these little pixies till they shrunk to a teeny tiny size. The pixies cried and flew around franically looking for food. As the pixies grew smaller and smaller the evil Graeme knew that his plan was working.

    "HA..HA...HA" the evil Graeme cried it wont be long now.
    Then one day the evil Graeme released all the pixies into a magical box. The box was filled with magical glowing electrons. The pixies ate and ate till they could no longer move. So full of glee they started to glow multiple shades of Red, Green, and Blue. Thus ends our tale of the Evil Graeme and his not so evil plan to make better Pixelies.


     

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    #9
    Senior Member lpcvideo1's Avatar
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    Quote Originally Posted by pywl
    The pixies ate and ate till they could no longer move. So full of glee they started to glow multiple shades of Red, Green, and Blue.
    Kinda like the rods and cones in our eyes, no?



     

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    #10
    Red Leader Jannard's Avatar
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    OK... 6pm. Time for everyone's medication.

    Jim


     

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