Use of PXP for image color conversion

sachinshewale — Mon, 05 Oct 2015 10:17:21 GMT

Hi,

We want to convert RGB image to RED/BLUE format. We are using PXP for this. Platform used: MCIMX6U8DVM10AC

Input Mode selected: DIRECT_RGB454

Output Mode Selected: RGB888

Input Image format: RGB888

Output Image format: RGB888

Lookup Table Data: 16KB

Address = 8K

Lookup table values:

LUT Data format: RGB565

D15 D14 D13 D12 D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

R R R R R G G G G G G B B B B B

From 0 to 4096:

0xF800 <Red Colour>

From 4096 to 8192:

0x001F <Blue Colour>

Please check and let us know if understanding is correct.

Re: Use of PXP for image color conversion

Yuri — Wed, 07 Oct 2015 08:54:17 GMT

Hello,

As stated in section 53.3.19 (DIRECT_RGB454) of the i.MX6 S/DL RM,
the address in the LUT is generated as: R[23:20], G[15:11], B[7:4].

This means R[23] bit defines if output data are Red or Blue.

I think, it would be better to use the most significant bits of each color : R[23], G[15], B[7] :

where these bits (12-th, 8-th, 3-th of LUT index) are set content should be 0x001F <Blue Colour>,

all the rest as - 0xF800 <Red Colour>.

Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

i.MX ProcessorsのトピックUse of PXP for image color conversion

Use of PXP for image color conversion

Re: Use of PXP for image color conversion