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something interesting about color noize reduction 1

edb1

Please take a look at the yellow paint on the ground between the two cars. The right picture is just imported without any change, the left one has no change either except 100 color noise reduction.

Should we call it a software bug or a disaster?


http://peri-archer.spymac.com/Share/untitled.JPG
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  • photogenix
    Very very interesting. The red taillight of the gold car also suffers a similar sort of chroma halo-effect. The left image has also cancelled-out the yellow reflection down the side of the dark 4wd, which I could understand the program interpreting as colour noise, that's fair enough.

    Even more interesting is the definition of the stripes in the reversing lights of the gold car, beside the registration plate, is actually better in the image on the left (isn't turning noise reduction up supposed to reduce detail?)! There are some aspects of the left image which appear to have more sharpening, such as this aspect.

    So really inconsistent results all-round.
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  • Andrew1211
    The left image clearly has sharpening applied to it, as well as noise reduction. Are you sure that you didn't sharpen it?

    Andrew
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  • edb1
    [quote="Andrew B." wrote:
    The left image clearly has sharpening applied to it, as well as noise reduction. Are you sure that you didn't sharpen it?

    Andrew


    I guess I did sharpen it. But even after I turn of sharpening, the problem persists. It's a problem of color noise reduction.
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  • Gary621
    It's a disaster alright. I've never seen anything quite like it.

    The colour noise reduction was superb in v3.7.7, how could it possibly go from superb to that?

    I shoot most of my images at high ISO. v4 is catastrophically bad at dealing with noise.
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  • Andre21
    Has anyone noticed that the luminance noise reduction slider in general is not effective at all for low ISO images? Even at a setting of 100%, there is hardly any NR applied to the image for ISO100 images. Version 3.7.6 was too sensitive, but V4 is not sensitive enough. Only at higher ISOs does the NR kick in. Bug? I reported this problem during the beta 2 testing but nothing was fixed.
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  • photogenix
    In v3 and before, my understanding is that the noise reduction slider was 'sensitive' to the current ISO. In other words, the first slider notch at ISO1600 would give more aggressive noise reduction than the same setting at ISO400 and, to some degree, giving a slightly consistent feel regardless of ISO. I'm assuming the same thing is occuring in v4, except that the aggressiveness for low ISOs is understated.
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  • Andre21
    That is not my experience for V3 and prior. In V3, the first notch gave too much NR for any ISO including ISO100. At full NR, the image was completely featureless. In V4, you can't get any setting to do any significant NR for ISO100 images. Give it a try. The slider just doesn't have any sensitivity.

    [quote="photogenix" wrote:
    In v3 and before, my understanding is that the noise reduction slider was 'sensitive' to the current ISO. In other words, the first slider notch at ISO1600 would give more aggressive noise reduction than the same setting at ISO400 and, to some degree, giving a slightly consistent feel regardless of ISO. I'm assuming the same thing is occuring in v4, except that the aggressiveness for low ISOs is understated.
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