Color plays a crucial role in the visualization, interpretation, and analysis of multi-wavelength astronomical images. However, generating color images that accurately represent the full dynamic range of astronomical sources is challenging. In response, Gnuastro v0.22 introduces the program 'astscript-color-faint-gray', which is extensively documented in the Gnuastro manual. It employs a non-linear transformation to assign an 8-bit RGB (Red-Green-Blue) value to brighter pixels, while the fainter ones are shown in an inverse grayscale. This approach enables the simultaneous visualization of low surface brightness features within the same image. This research note is reproducible with Maneage, on the Git commit 48f5408.

翻译：颜色在多波段天文图像的视觉化、解释与分析中扮演着关键角色。然而，生成能够准确呈现天文源全动态范围的彩色图像仍存在挑战。为此，Gnuastro v0.22 引入了程序 'astscript-color-faint-gray'，该程序在 Gnuastro 手册中已有详尽文档。它采用一种非线性变换，将较亮像素赋予 8 位 RGB（红-绿-蓝）值，而较暗像素则以反灰度形式呈现。这种方法使得在同一图像中同时可视化低表面亮度特征成为可能。本研究笔记可通过 Maneage 复现，对应 Git 提交 48f5408。