H

H II regions 521 high-pass filters 381 high-point pixel values 210 high-resolution images 147 Hipparchos Catalog 252 histogram equalization 362 HISTORY (FITS keyword) 61 hot pixels 46, 163 hot spots 102, 103 how to shoot dome flats 184 shoot light-box flats 184 shoot sky flats 186 shoot twilight flats 186 how to install AIP for Windows 613 HSL color space 541 hue 541

Huggins, William 304 human color vision 514 hydrogen hypersensitizing 13

image aspect ratio 23 calibration advanced 191 basic 187 standard 189 feature analysis 212 histogram 210 profiles 220 stacking 199

times-five rule of thumb 172 image calibration advanced 441 basic 440

dark subtraction 436 flat-fielding 438 standard 441 image estimation by iteration 501 image math absolute difference 429 addition 425 average 432 division 429 merge 430 multiplication 428 subtraction 426 image ranking maximum 435 median 433 minimum 435 image registration rotation 444 scaling 444 translation 443 impulse function 485 instrumental zero point 275 interference filters 549 interline-transfer CCDs 17 internal lens reflections 104 inverse convolution problem 500 inverse wavelet transform 480 iterative wavelet noise filter 492

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