反色的月亮

2022年3月8日

Moon in Inverted Colors
Image Credit & Copyright: Dawid Glawdzin

Explanation: Which moon is this? It’s Earth’s moon — but in inverted colors. Here, the pixel values corresponding to light and dark areas have been translated in reverse, or inverted, producing a false-color representation reminiscent of a black and white photographic negative. However, this is an inverted color image — where the muted colors of the moon are real but digitally exaggerated before inversion. Normally bright rays from the large crater Tycho dominate the southern (bottom) features as easily followed dark green lines emanating from the 85-kilometer diameter impact site. Normally dark lunar mare appear light and silvery. The image was acquired in Southend-on-Sea, England, UK. Historically, astronomical images recorded on photographic plates were directly examined on inverted-color negatives because it helped the eye pick out faint details.

Tomorrow’s picture: martian rock flower

反色的月亮
影像提供与版权: Dawid Glawdzin

说明: 这是那颗卫星呢？它是月亮，只是颜色经过反转而已。在这幅影像里，与淡色与暗色对应的像素值经过反转（或反色），所制作出的假色影像酷似黑白照片的负片。话虽如此，它是个如假包换的反色影像，其中月亮的淡色区是真的，只是先经过数位夸大然后才反转。所以月面南缘（影像底部）源自85公里直径第谷坑的明亮辐线，成为从此撞击坑射出、轻易可辨的暗绿色线纹。而在这幅摄于英国英格兰滨海绍森德市的影像里，通常很黝黑的月海，反而变成银白色。在历史上，使用照像底板记录的天文影像，通常会直接在反色负片底板进行检视，因为肉眼反而较容易认出暗淡的结构细节。

明日的图片: martian rock flower