Originally Posted by xrox
Yes, I know it is AC. Like I said, I've never heard the subfield method described as dithering. And no, halftoning is not a combination of sufbfields.
We are having a problem regarding the terms and names of the dithering method, i'll go into this without using an specific term.
So, let me expand a bit on this. The combination of the subfields generate the final tonality, in a similar way the combination os subpixels generate the final pixel color, as you said a group of pixels together to achieve the final intended shade through dithering.
The process of alternating the brightness (i'll use brightness here instead of luminance) of the combinated
subfields effectively is the process behind the final shades rendered. Therefore the dithering and the halftoning. More bellow.
Originally Posted by xrox
We agree that the # of sustain pulses determine subfield width. Now do you agree that binary or contiguous combinations of subfields
determine how many levels of gray a single
subpixel can render?
Yes in part (i believe all, but there is something i want to clarify), there seems to be a confusion related to the ADS method. I believe in the end we will agree. But i am touching the point that the intensity of the combination of the sustain pulses is the main process behind the shades. it controls the brightness of the shades, therefore its tonality, the final shade. So, there are two process we are actually talking about, the first is the width of the subfields (related to the sustain pulses), and based on this width the combination of the subfields will render a shade (in a single subpixel). So this method of achieving a final width (brightness...) of the subfield and shade is Dithering from the beginning. All the methods used are randomizing the quantization error, the different intensities or widths that can be adressed are a representation of a "shade" data received by the PDP, that will be rendered through approximation achieved through combinations of widths of subfields and its combinations.
So, basically this everything is dithering, till we reach the final halftoning dithering of the combined pixels.
I don't know what you mean exactly by your last part, but error difusion, spatial dithering,... are indeed types of halftoning (like you mentioned), a cluster of dots (or whatever one wants to call) put together is an example. Another nice example from wikipedia can clarify why i used the term halftoning:
"Shades of gray were rendered by intermittently raising and lowering the pen, depending upon the luminance of the gray desired."http://en.wikipedia.org/wiki/Error_diffusion
Nothing new there, for any of us, i believe we easily agree.