File:Subpixel demonstration (Quartz).png

Summary[edit]

How the image was created[edit]

First, Apple's text editing program TextEdit was used to draw the text at 12 and 18 pt (72 dpi) and captured by taking a screenshot. The images were imported in Photoshop and positioned. The two images were then duplicated and scaled up with nearest-neighbour sampling, 600%. Then the following Python script was used to split the components of the source image into three vertical components:

#!/usr/bin/env python

from AppKit import *
from Foundation import *
import sys

image = NSImage.alloc().initWithContentsOfFile_(sys.argv[1])
imageRep = image.representations()[0]

bmpData = imageRep.bitmapData()

numPixels = len(bmpData) / 3

if sys.argv[2] == "1":
 for p in range(numPixels):
 (r,g,b) = bmpData[p*3:(p+1)*3]
 sys.stdout.write(3*r)
 sys.stdout.write(3*g)
 sys.stdout.write(3*b)
elif sys.argv[2] == "2":
 nul = '\0'
 for p in range(numPixels):
 (r,g,b) = bmpData[p*3:(p+1)*3]
 sys.stdout.write(r+nul+nul)
 sys.stdout.write(nul+g+nul)
 sys.stdout.write(nul+nul+b)

The above script was used twice per text image (the raw screenshot), producing four distorted image that were three times as wide as normal. They were imported into Photoshop using the RAW format import. Each of the four images was scaled like this, with nearest-neighbour sampling:

• Scale height 300%.
• Scale width and height 200%.

The resulting images had the same scale as the original text that had been enlarged 6 times. The enlarged images were cropped to an approximate square and positioned like they appear in the final image.

The Photoshop file, with intact layers, can be acquired by mailing the copyright holder. In the future, I plan to upload it to the wiki, but right now Photoshop files are unfortunately not supported by MediaWiki.

Licensing[edit]

Chmod007 at the English Wikipedia, the copyright holder of this work, hereby publishes it under the following license:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	Attribution: Chmod007 at the English Wikipedia
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

Original upload log[edit]

• 2004-10-27 20:10 Chmod007 666×474×8 (90438 bytes) Infinitesimally small tweak to the position of one of the texts.
• 2004-10-27 20:05 Chmod007 666×474×8 (90427 bytes) New version, luminance corrected (though the lack of colour management will probably make it look just as bad on many computers.) Still (c) David Remahl, {{GFDL}}
• 2004-10-27 13:09 Chmod007 666×474×8 (75149 bytes) minor correction of the colours in the mid-lower cell
• 2004-10-27 11:54 Chmod007 666×474×8 (93082 bytes) Demonstration of subpixels. Detailed description forthcoming. © [[2004]] [[User:Chmod007|David Remahl]]. {{GFDL}}