After loading 24-bit depth image max pixel value is 255

[Pavel_47]

Hello,

Here is a small example where 24-bit depth image is loaded as Grayscale 16-bit.

The maximum pixel value is 255, but not 65535.

Loading as Grayscale (SGL), i.e. float, 32bit produce the same result.

2 questions:

• is there a workaround allowing to load 24-depth image as 16-bit
• is there some option in "google image search" allowing to find 16-bit images

Thanks

[GerdW]

Hi Pavel,

is this a "standard" JPEG you try to load? A JPEG with just 8bit color information?

When there is only information of 8 bit color entries you can not magically blow them up to U16 or SGL values…

[Pavel_47]

Hi GerdW

Here is file properties of the image that I've found with Google (specifying BW option).

If I properly understood your comment, for BW jpeg images only 8 bits are significant?

If it's the case, my 2nd question is probably more relevant, i.e. how find true 16-bit depth BW image on web without having to download each image and check its properties.

[GerdW · Accepted solution]

Hi Pavel,

If I properly understood your comment, for BW jpeg images only 8 bits are significant?

24bit = 3×8bit (RGB)…

how find true 16-bit depth BW image on web without having to download each image and check its properties.

I would search for "16 bit grayscale images". And I would use other image formats like PNG or TIFF instead of JPG…

[Pavel_47]

Ok, thanks