New Silicon LUT>colorspace?
rjo__
Posts: 2,114
BIG THANKS to Brian and Ray for the HyperRam examples.
Quite useful since I couldn't get regular VGA working on my shiny new ES:)
I started modifying Ray's code to get my Stereo PropCam going... and immediately I ran into an itsy bitsy, tiny, tiny issue with the LUT.
I converted the 8 bit 640x480 color "bitmap2.bmp" to grayscale in ImageJ and re-exported it as "bitmap2g.bmp"
The Image was fine... except absolute white(255). Which appears pure blue... on two different monitors.
I wrote a routine to force the lut values to be in the 0 to 255 range and the little spot on the bird's head still appears blue.
I have turn the ES off and back on to rerun the code. No joy.
>PS in my routine there is a legacy line using rdfast… which I neglected to omit. It is harmless:)
Quite useful since I couldn't get regular VGA working on my shiny new ES:)
I started modifying Ray's code to get my Stereo PropCam going... and immediately I ran into an itsy bitsy, tiny, tiny issue with the LUT.
I converted the 8 bit 640x480 color "bitmap2.bmp" to grayscale in ImageJ and re-exported it as "bitmap2g.bmp"
The Image was fine... except absolute white(255). Which appears pure blue... on two different monitors.
I wrote a routine to force the lut values to be in the 0 to 255 range and the little spot on the bird's head still appears blue.
waitx ##50000000
mov x,#0
rep @.end,#$100
setbyte y,x,#0
setbyte y,x,#1
setbyte y,x,#2
shl y,#8
wrlut y,x
add x,#1
.end
I have turn the ES off and back on to rerun the code. No joy.
>PS in my routine there is a legacy line using rdfast… which I neglected to omit. It is harmless:)
Comments
The attached program is from Ray. I have commented out the cognew for HyperRam. So it is essentially VGA:)
What I am finding is that the grayscale with other apps the bitmap is fine, but with the attached app, pixels with value of 255 are pure blue.
To try to fix this, I generate my own lut values, but it doesn't help.
So... if you have VGA 640x480 going... trying loading this bmp and see what you see:)
Not seeing it on my setup. Generated a grayscale sequence from 0-255 and don't see any blue line on the LCD monitor. Might possibly be some range or colour setting on your monitor(s) perhaps.
PUB demo | x,y repeat x from 0 to 255 mypalette[x]:=x*$1010100 '$ffffff_00 repeat x from 0 to 511 repeat y from 0 to 128 byte[@screen][x+640*y]:=x clkset(_clkmode, _clkfreq) initDisplay(@display1, O_VGA, @vga_timing, VGA_BASE_PIN, VGA_VSYNC_PIN, F_RGBHV, @lineBuffer, 0) ' create a VGA display initRegion(@first, 0, 3, 0, @mypalette, @fontega14, 14, @screen) ' create first regionLook for "Here's the original VGA example, modified for Rev.B "
See how that works with your bitmap image....