Blue tint to the exported images from LR 2.4

A particular image, that I exported from LR appears slightly more blue than it does in the LR library. At first I thought it's maybe because I export from a raw image in sRGB and downsizing a lot, but this isn't the cause.

If I take the image of LR and EDIT in PHOTOSHOP CS3 using TIFF 16 bits and ProPhoto and then in Photoshop manually reduce 640 pixels on its longest side, change it to 8 bits per channel and ProPhoto convert to sRGB, the resulting image is not this blue tint and, in my view, exactly looks the same as the view from LR library. But if I ask LR for export in a 8-bit sRGB TIFF and reduce the size of 640 pixels, with no job of sharpening, the result has the blue tint.

I have attached a screenshot with LR in the background and two windows photoshop: the left one is photoshop glancing tiff that LR exported; the right is Photoshop showing the same image will be created manually as described in my second para. I find that one on the left has a bluish tint, particularly in the foliage over the arms of the shovel. Flicking between the two windows photoshop, the histogram is clearly more blue in the left.

Of course, you can say well, "Photoshop isn't Lightroom, so there are small differences. I accept it. But the fact is that Photoshop agrees with LR, this is just EXPORT from LR service that produces a result that is more blue.

No idea why this should be so? (I have not noticed this on other images)

I find that quite strange for sRGB, BTW, because the color is the smallest space the most important, one might think, to have the perception during the conversion in it.

It has historical reasons. When sRGB was designed none of this really existed yet. Recently the ICC made a new sRGB version which has no perceptual intent. You can use it in Photoshop, but strangely, Lightroom doesn't know how to use it.

When you refer to the scale, I'm not sure what you mean. Do you mean the alteration of color that occurs when mapping range of one color space to another? Sorry, I don't know anything about. But what at first glance seems odd is that why should the color of a pixel mapping be in any way affected by the values of adjacent pixels? (I guess this must be the case for effect "in areas with a lot of detail", as you suggest.

I refer to the reduction of scale to 640 pixels wide that you do. It is very simply with an average value of the pixels within a zone to arrive at a new image of low resolution. For example, if your original is 3000 pixels wide, and you go to 500 pixels wide, you are averaging an area of 6 x 6 pixels (i.e. 36 pixels) for a single pixel value in the new image. In practice several different algorithms are used to do this, but the basic principle is the same. Lightroom evolves in a linear space, which means that the brightness (luminance) is a linear function of the values bit. This translates into the luminance of the final pixel being correct anything. Photoshop scales in the gamma corrected space of the profile document (gamma 1.8 for prophotoRGB and approximately 2.2 to sRGB). Gamma means that the lightness of a pixel is dependent on the value of bit powerlaw. This translates into the luminance is not always correct with the end result. Whether move you in linear space or corrected gamma issues only when you have lots of small details. Course, when you have a plan of color, no matter that you will come to the same value. However, if you have a lot of edges, there are an error of scale to gamma corrected space. This is detailed in a page I found a quick google here: http://www.4p8.com/eric.brasseur/gamma.html

So scaling in linear space is preferable from the point of view correct color. However, it leads to the desaturation and maybe look less good.

A second point that I would put to LR is this: no matter how you do this scaling, why you cannot export a file that resembles that on my screen of LR? The fact that they are different certainly suggests that LR does not use this linear gamma of scale displaying the pictures, then we could add "look, do go and stick to it; don't chop and move one feature from LR to another. »

Here, you have run in one of the many peculiarities of Lightroom. Because it is made of the jpeg extracted in adobeRGB (in general), the scaling of the display in libraries and other is in a gamma corrected space and so resemble the Photoshop scale. To the point, there is no scale is done, but the view zoomed on is a rendering that is similar to using nearest neighbor scaling. For reasons of speed, it only displays a subset of the pixels. So, with an average of pixels is made. In addition, any color and sharpness noise reduction is applied in the zoomed view on. This means that the zoomed view on developing countries is often saturated. This can be a real problem. There are many images where this leads to completely wrong impression in the zoomed view on. An example would be an image of Christmas lights that will look very colorful with zoom out but when zoom you 1:1 (or go to the library) they lose all color because the color noise reduction, which is then applied. Sea of flowers in the grass, light neon, colored fabrics, etc., are other examples. If you have a lot of microdetail, only display that's really right in Lightroom to develop is the view of 1:1. This is largely fixed in LR 3 BTW, where he restores to a larger size, including the reduction of noise and sharpening and then further reduced to develop.

I realize that you are not responsible for the LR... no bad vibes intended

Not bad actually. I love Lightroom, but realize that there are many gaps. In my work, I do a lot of scientific image processing and I'm always curious to see how things are really make.

Tags: Photoshop Lightroom

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