Photoshop with 16 bit colors

Hi,
Is it possible to work with 16 bit colors in Photoshop ?
I have some bitmaps, where I would like to change the colortable from 24 bit colors to 16 bit colors.
Thanks,
best regards,
Poul

Let us consider the possibilities of the file format Windows Bitmap BMP. Photoshop can save
as BMP with different color depths, but this has nothing to do with "Photoshop Bitmap".
Mode Indexed color (BMP, 8 bit per pixel) uses a color look-up table, a CLUT:
256 rows with 3 bytes for R, G and B (one byte each).
The image contains for each pixel one byte, which is a pointer to the CLUT,  from where the
color bytes are taken. Finally we have a 24 bit per pixel color representation (True color).
For GIF it's almost the same, but one row in the CLUT means transparency.
Building the CLUT for an image which may contain originally 256^3 diffent colors is called
Color quantization (a key word for a further search).
If the display should require a smaller number of bits, e.g. 5R, 6G, 5B (green is more accurate),
then the CLUT can be taken from the Indexed color BMP image and modified:
R: Shift right 3 bits and round
G: Shift right 2 bits and round
B: Shift right 3 bits and round
Assemble R,G,B in one word with 16 bit.
Similarly, if the display should require 5R, 5G, 5B.
Such a table cannot be generated directly by Photoshop.
Mode High color (BMP, 16 bit per pixel) does not use a CLUT. Perhaps, at the time when these
file formats were developed, a CLUT with 2^16 rows was considered as nonsensical.
Photoshop can generate a BMP image with 16 bit per pixel by one of three modes, as explained
earlier in my previous post.
Thus it is possible to convert an image, which contains an arbitrary number of "swatches"
as defined by True Color 24 bit per pixel, into High color 16 bit per pixel by Photoshop. From the
result one can take the coding and build a table.
Arbitrary means: up to the maximal number, e.g. 32*64*32 swatches for 5R 6G 5B.
The further proceeding depends strongly on the decision   only 256 colors / more colors.
Accepting the 16 bit per pixel limit, one may use a fixed full size CLUT and an automatic conversion
True Color – High Color with Dithering.
Best regards --Gernot Hoffmann

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