Imatge:Alpha Centauri relative sizes.png
De Viquipèdia
![Imatge:Alpha Centauri relative sizes.png](../../../../images/shared/thumb/1/17/Alpha_Centauri_relative_sizes.png/800px-Alpha_Centauri_relative_sizes.png)
Mida d'aquesta previsualització: 800 × 290 píxels
Imatge en màxima resolució (3.770 × 1.368 píxels, mida de l'arxiu: 56 KB, tipus MIME: image/png)
Aquest arxiu és una càrrega compartida, extreta del projecte Wikimedia Commons i pot ser usada per altres projectes. Si voleu disposar de més informació sobre el fitxer, podeu visitar la pàgina original |
[edit] Summary
A comparison of the sizes and colors of the stars in the Alpha Centauri system with the Sun.
David Benbennick made this image on January 29, 2005 with the following Metapost program as stars.mp:
verbatimtex \font\foo=cmss9 at 10pt \foo etex sunrad=0.3in; alpharad = 1.227*sunrad; betarad = 0.865*sunrad; proximarad = 0.145*sunrad; gap = 0.8*sunrad; pair sunpos, alphapos, betapos, proximapos; sunpos = (0 + gap + sunrad, 1.9*sunrad); alphapos = sunpos + (sunrad + gap + alpharad, 0); betapos = alphapos + (alpharad + gap + betarad, 0); proximapos = betapos + (betarad + gap + proximarad, 0); beginfig(1); fill unitsquare xscaled ((xpart proximapos) + proximarad + gap) yscaled (2 * (ypart sunpos)); fill fullcircle scaled (2*sunrad) shifted sunpos withcolor (1,0.960,0.949); % Color is fff1ed label.bot(btex Sun etex, sunpos - (0, sunrad)) withcolor white; fill fullcircle scaled (2*alpharad) shifted alphapos withcolor (1,0.960,0.949); label.bot(btex $\alpha$ Centauri A etex, alphapos - (0, alpharad)) withcolor white; fill fullcircle scaled (2*betarad) shifted betapos withcolor (1,0.878,0.737); % ffe0bc label.bot(btex $\alpha$ Centauri B etex, betapos - (0, betarad)) withcolor white; fill fullcircle scaled (2*proximarad) shifted proximapos withcolor (1,0.752,0.411); % ffcc6f label.bot(btex Proxima etex, proximapos - (0, proximarad)) withcolor white; endfig; end;
And I had the following TeX file as stars.tex:
%&latex \documentclass[10pt]{article} \usepackage{graphicx} \pagestyle{empty} \begin{document} \includegraphics{stars.1} \end{document}
Then I ran
mpost stars tex stars dvips -mode ljfzzz -D 1200 stars -o convert -density 1200 -chop 99999x99999+6249+3463 -chop 2479x2095 stars.ps stars.png pngcrush -reduce -brute -l 9 stars.png stars.crush.png
stars.crush.png was the final output file.
(Apparently it's non-trivial to get dvips to use a given resolution. I would have preferred to use 1600 dpi, but dvips didn't already have a "printer" at that resolution. ljfzzz, at 1200, was the best I could find.)
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[edit] References
Historial del fitxer
Cliqueu sobre la data/hora per veure el fitxer tal com era aleshores.
Data/Hora | Dimensions | Usuari | Comentari | |
---|---|---|---|---|
actual | 07:41, 4 feb 2005 | 3.770×1.368 (56 KB) | Dbenbenn | (sans serif fonts version) |
08:42, 30 gen 2005 | 5.029×1.825 (94 KB) | Dbenbenn | (higher resolution version) | |
05:50, 30 gen 2005 | 2.515×913 (24 KB) | Dbenbenn | (star size and color comparison) |
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