Difference between revisions of "Talk:Rasters"

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Ok, a first try, please tell if this exist...
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*The original page describe the rupture effect (seperate section scrolling), but rasters do not do this.
Also, should we use raster or maybe other terms ?
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Concepts : Raster, split raster, Raster lines or Scanlines ?
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In programation, the raster is often referred as the act to modify the setting of inks between 2 scanlines.
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My understanding of rasters is to make coloured bars, either vertically, horizontally, diagonally or messages scrolling.
  
This is a way to display more than the usual [[Video modes]] number of colours.
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*I'm probably not the better qualified to talk about this.
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I just put some overviews (some may be false) and links.  
  
The time between the display of 2 Scanlines by the CRTC allow the CPU to order the Gate array to modify the setting of inks.
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The problem is that the word Raster is over used in Demoscene  but may have a bit different scientific definition.
  
The screen display at 50Hz...The [[CPU]] ([[Z80]]) runs at about 4 MgHz.
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The coloured horizontal bars are called rasters...but this is only a little use of rasters.
  
So It has enough cycles between 2 scanlines to order this.
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Also what is the difference between rasters and split rasters ? this is not always clear in my mind.
  
You can also use Split rasterto "actually" display 2  different screens, sometoimes with different Video Modes.
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[[MacDeath]]
  
 
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*The updated page tells you now [[Kevin Thacker]]
 
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==Links==
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*[http://en.wikipedia.org/wiki/Raster Wikipedia link to Raster concepts]
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==CPCWiki Links==
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*[[Gate Array]]
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*[[CRTC]]
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*[[ASIC]]
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*[[Synchronising with the CRTC and display]]
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*[[Programming:Simple Raster Example 1]]
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*[[Programming:Simple Raster Example 2 (uses CPC plus features)]]
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*[[Programming:Simple Raster Example 3 (uses CPC plus features)]]
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*[[Programming:Simple Split Raster Example 1]]
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[[Category:Graphic]][[Category:Programming]][[Category:Stub]]
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Latest revision as of 09:45, 14 October 2009

  • The original page describe the rupture effect (seperate section scrolling), but rasters do not do this.

My understanding of rasters is to make coloured bars, either vertically, horizontally, diagonally or messages scrolling.

  • I'm probably not the better qualified to talk about this.

I just put some overviews (some may be false) and links.

The problem is that the word Raster is over used in Demoscene but may have a bit different scientific definition.

The coloured horizontal bars are called rasters...but this is only a little use of rasters.

Also what is the difference between rasters and split rasters ? this is not always clear in my mind.

MacDeath