... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Working with color . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Color . Selections . ... Modifying Selections . ... Magic Wand- selects part of an image based on the similarity in color of adjacent pixels. ... Enter a value in pixels, ranging from 0 to 255. A low value selects the few colors very similar to the pixel you click. A higher value selects a broader range of colors. ... Otherwise, all pixels in the entire image using the same colors are selected. ... Select a sample color and than the add sample dropper to refine your selection. ...

To change the Scaling Function (how pixel values are binned into color levels): . ... For example, the basic grey-scale color map specifies no intensity for any color at the lowest color level, full intensity for all colors at the highest color level, with the red, green and blue intensities varying linearly for intermediate levels. ... At low bias, low color levels (i.e., low pixel values) will have non-zero intensities, while at high bias only high pixel values will have non-zero intensity. ...

... Parent Directory - alcaino_m4_1988.pdf 2007-04-09 00:50 3.2M colors.agr 2007-04-11 02:44 12K colors.eps 2007-04-11 02:45 13K colors.png 2007-04-11 02:44 6.3K m4_b_10_d.fits 2007-04-11 02:10 12M m4_i_10_d.fits 2007-04-10 23:38 12M m4_i_blue_meas.reg 2007-04-11 02:21 1.4K m4_i_cal.agr 2007-04-11 00:42 41K m4_i_cal.dat 2007-04-10 23:44 60 m4_i_meas.reg 2007-04-11 01:14 1.0K m4_i_red_meas.reg ...

... Meta Index / Home Page / Description xcolorcod provides a list of pre-defined color tables that is identical to the internal color maps of the image displayer Ds9 . ... LEVEL . ... RED . ... The table can also be regarded as defining three separate curves for the three basic colors red, green, and blue and piecewise linear interpolation is carried out for intermediate LEVEL values. ... 0 So a pixel with a scalar value of e.g. will be assigned a color with 50% red, 17% green, and no blue intensity. ...

... The color selection widget is, not surprisingly, a widget for interactive selection of colors. ... Clicking on it opens a color selection dialog, and changing the color in the color selection dialog changes the background color . #include glib.h #include gdk/gdk.h #include gtk/gtk.h GtkWidget *colorseldlg = NULL; GtkWidget * drawingarea = NULL; GdkColor color ; /* Color changed handler */ void color _changed_cb( GtkWidget * widget , GtkColorSelection * ... File...

... User Guide ] Key: select This keyword selects the subset of the visibility data to be processed. ... If only one value is given, uvmin is taken as zero. uvnrange(uvmin,uvmax) Select visibilities with uv radius between uvmin and uvmax (in nanoseconds). If only one value is given, uvmin is taken as zero. visibility(n1,n2) Select visibilities numbered n1 to n2 inclusive. increment(inc) Select every inc'th visibility. ra(r1,r2) Select visibilities whose RA is in the range r1 to r2. ...

home education > resources . ... Education from Mercury . ... Selected Topical Bibliographies . Astronomy Education Bibliography . ... Astronomical Pseudo-Science . ... Foothill College the Astronomical Society of the Pacific) . ... Sletteback, A. Jettner, F. "Proceedings of the Conference on Education in Astronomy, August 1969" in Bulletin of the American Astronomical Society, vol. 2, p. 254 (1970). ... Accompanied, later in the same book, by a "Catalog of National Astronomy Education Projects".) ...

... L -Slen/2.0 + amplitude*cos(t*frequency),0) gravforce = G* block.mass ## viscous friction if viscous == 1: ffriction.x = -u*block.vel.x ## end viscous friction ## sliding and air resistance if (block.vel.x 0): if sliding == 1: ffriction.x = u*gravforce ## sliding if air == 1: ffriction.x = u*(block.vel.x**2) ## air resistance else: if sliding == 1: ffriction.x = -u*gravforce ## sliding if air == 1: ...

Permitted Context: SELECT . ... The OPTION element can only occur within a SELECT element. ... When the form is submitted, the NAME of the enclosing SELECT element is paired with the OPTION's VALUE attribute to contribute a name/value pair for the selection. ... CLASS . ... The string to be used together with the name attribute of the enclosing select element, when submitting the form. ... SELECTED . ... This attribute is used within menus to define shaped hotzones associated with this option's value. ...