获得EXR图像亮度

发布于 2025-01-24 02:43:01 字数 1110 浏览 4 评论 0原文

据我所知，我认为要获得图像。EXR亮度我们必须在不同的曝光中渲染图像并将其收集成一个？

这是我在Adobe中制作的图像，在EXR扩展中具有不同的亮度，从0（左）到10（右）。 exr_to_png_png_forviewingpurpose

：

首次测试 link ：

magick .\img.exr -evaluate multiply 2 img1EV.png

此 3ev，但是Negatif EV给我一个空图像。

第二个测试：

我在此上看到链接使用不同的曝光为0.1、0.2、0.4等... 我在SOFware上做了与他相同的曝光价值。

接下来，我在PY中实施了一个程序，以从PNG获得正确的亮度（如建议在这里）。

最后，对于第一个测试，我对每个图像的曝光都具有相同的结果。对于第二次测试，我确实有不同的图像，但是之后我不知道该怎么办。我不知道这是否是正确的方法，希望有人知道。

firstTest结果 secondtest结果

原文

As far as i know, I think to get an image.exr luminance we have to render the image in different exposure and gather them into one ?

Here is my image made in Adobe which have different luminance from 0(left) to 10 (right) in exr extension.
exr_to_png_forViewingPurpose

FIRST TEST :

so I tried ImageMagick with this command line from this link:

magick .\img.exr -evaluate multiply 2 img1EV.png

So I did the same for +-2EV, and +-3EV but the negatif EV give me an empty image.

SECOND TEST :

I saw on this link that use different exposure as 0.1, 0.2, 0.4 etc...
I did the same with a sofware to get the same value of exposure as him.

Next, I implemented a program in py to get the right luminance from a png (as suggested here).

In the end with the first test, I have the same result for each image that have different exposure.
For the second test, I do have different image but I don't know what to do with them after that.
I don't know if it's the right way to do it, hope someone knows.

FirstTest Result
SecondTest Result

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