我的最终目标是解码来自多个摄像头的 CR2 图像，以便在桌面 gui 中显示。
使用 LibRaw 图像解码库，我使用示例项目尝试将 CR2 图像解码为 .TIFF 文件。
作为jpg缩略图的原始文件如下：
解码后保存为.TIFF的原始CR2如下：
如您所见，结果略亮且偏黄。
示例项目包含以下用于解码图像的参数：
"-c float-num Set adjust maximum threshold (default 0.75)\n"
"-v Verbose: print progress messages (repeated -v will add verbosity)\n"
"-w Use camera white balance, if possible\n"
"-a Average the whole image for white balance\n"
"-A <x y w h> Average a grey box for white balance\n"
"-r <r g b g> Set custom white balance\n"
"+M/-M Use/don't use an embedded color matrix\n"
"-C <r b> Correct chromatic aberration\n"
"-P <file> Fix the dead pixels listed in this file\n"
"-K <file> Subtract dark frame (16-bit raw PGM)\n"
"-k <num> Set the darkness level\n"
"-S <num> Set the saturation level\n"
"-n <num> Set threshold for wavelet denoising\n"
"-H [0-9] Highlight mode (0=clip, 1=unclip, 2=blend, 3+=rebuild)\n"
"-t [0-7] Flip image (0=none, 3=180, 5=90CCW, 6=90CW)\n"
"-o [0-5] Output colorspace (raw,sRGB,Adobe,Wide,ProPhoto,XYZ)\n"
#ifndef NO_LCMS
"-o file Output ICC profile\n"
"-p file Camera input profile (use \'embed\' for embedded profile)\n"
#endif
"-j Don't stretch or rotate raw pixels\n"
"-W Don't automatically brighten the image\n"
"-b <num> Adjust brightness (default = 1.0)\n"
"-q N Set the interpolation quality:\n"
" 0 - linear, 1 - VNG, 2 - PPG, 3 - AHD, 4 - DCB\n"
#ifdef LIBRAW_DEMOSAIC_PACK_GPL2
" 5 - modified AHD,6 - AFD (5pass), 7 - VCD, 8 - VCD+AHD, 9 - LMMSE\n"
#endif
#ifdef LIBRAW_DEMOSAIC_PACK_GPL3
" 10-AMaZE\n"
#endif
"-h Half-size color image (twice as fast as \"-q 0\")\n"
"-f Interpolate RGGB as four colors\n"
"-m <num> Apply a 3x3 median filter to R-G and B-G\n"
"-s [0..N-1] Select one raw image from input file\n"
"-4 Linear 16-bit, same as \"-6 -W -g 1 1\n"
"-6 Write 16-bit linear instead of 8-bit with gamma\n"
"-g pow ts Set gamma curve to gamma pow and toe slope ts (default = 2.222 4.5)\n"
"-T Write TIFF instead of PPM\n"
"-G Use green_matching() filter\n"
"-B <x y w h> use cropbox\n"
"-F Use FILE I/O instead of streambuf API\n"
"-timing Detailed timing report\n"
"-fbdd N 0 - disable FBDD noise reduction (default), 1 - light FBDD, 2 - full\n"
"-dcbi N Number of extra DCD iterations (default - 0)\n"
"-dcbe DCB color enhance\n"
#ifdef LIBRAW_DEMOSAIC_PACK_GPL2
"-eeci EECI refine for mixed VCD/AHD (q=8)\n"
"-esmed N Number of edge-sensitive median filter passes (only if q=8)\n"
#endif
#ifdef LIBRAW_DEMOSAIC_PACK_GPL3
//"-amazeca Use AMaZE chromatic aberrations refine (only if q=10)\n"
"-acae <r b>Use chromatic aberrations correction\n" //modifJD
"-aline <l> reduction of line noise\n"
"-aclean <l c> clean CFA\n"
"-agreen <g> equilibrate green\n"
#endif
"-aexpo <e p> exposure correction\n"
// WF
"-dbnd <r g b g> debanding\n"
#ifndef WIN32
"-mmap Use mmap()-ed buffer instead of plain FILE I/O\n"
#endif
"-mem Use memory buffer instead of FILE I/O\n"
"-disars Do not use RawSpeed library\n"
"-disinterp Do not run interpolation step\n"
"-dsrawrgb1 Disable YCbCr to RGB conversion for sRAW (Cb/Cr interpolation enabled)\n"
"-dsrawrgb2 Disable YCbCr to RGB conversion for sRAW (Cb/Cr interpolation disabled)\n"
"-disadcf Do not use dcraw Foveon code either if compiled with demosaic-pack-GPL2\n"
我尝试了各种选项来复制缩略图中的图像，例如白平衡 (-w)、插值质量 (-q N) 和嵌入颜色矩阵 (+M)。当我使用白平衡时，它去除了淡黄色调，但产生了明亮的图像。然后我继续禁用自动增亮（-W），它产生了一个非黄色的图像，但比缩略图暗得多。
哪些图像解码参数将帮助我将 CR2 解码为看起来像缩略图的高质量图像（在颜色、亮度等方面）？