My Experience and Findings of Sony A7R IV Pixel Shilft Multi Shooting

These are my conclusions only. Sorry I am a lazy guy to write down everything. But if you have any questions, I will be glad to reply.

1. First of all, you should check and explore these apps:
   • Imaging Edge Desktop
   • PixelShift2DNG
   • RawTherapee
2. Setting the shooting interval to "shortest" does not cause final compensation misalignment. Conversely, nearly every shot with a 3-second interval will result in misalignment. I have tried many times and confirmed the result, just in my cases.
3. Using the PixelShift2DNG app to synthesize a DNG file is simple and enables the synthesis of a single 240 MP DNG. However, it is incapable of performing unique algorithms and lacks motion compensation. Which means you get no control of the mid-processing. Make sure you have no misalignment during the shooting.
4. The RawTherapee pixel shift algorithm significantly improves the overall quality of a photograph. For example, the RawDecoding module can resolve anomalous color dispersion caused by jagged pixels, and the CaptureSharpen module dramatically enhances resolution. Moreover, RawTherapee provides automatic motion object masking correction compensation. This is contingent upon providing a single ARQ that contains 16 RAW data files.
5. ARQ files can be merged quickly in bulk using Sony's software. They are packaging 16 ARW files. And the ARQ files are decoded and ready for PixelShift2DNG and RawTherapee. You may consider the ARQ format as an archival.
6. If you get a proper 16-shot merged photograph, the final resolution is significantly improved, surpassing 60 MP. By my visual estimation, it at least reaches 100 MP.
7. 4-shot merged photograph has a minimal impact on resolution and essentially only serves to repair 60 MP's missing chroma information. A visual improvement is hardly to discern unless it's a striped pattern.
8. A 5-second long exposure does not result in an abnormal composite outcome.
9. Dynamic range improves significantly after merging 4 or 16 images. At a minimum, merging four shots results in a dynamic range increase of 1 EV more than a single shot, and merging 16 images provides a dynamic range increase greater than merging four images, with even cleaner under-exposed shadow recovery.
10. In practical application, you may use 16-shot merging for resolution improvement. Unless moiré patterns are needed elimination, merging four images has limited significance, but it's highly recommended for dynamic range improvement.
11. For the 16-shots merging mode, F4 is the optimal aperture and diffraction begins at F5.6.

这是我的结论，但很抱歉我比较懒，没有写下所有细节。如果你有任何问题，我很乐意回答。

1. 首先，你应该检查和探索以下这些应用程序：
   • Imaging Edge Desktop
   • PixelShift2DNG
   • RawTherapee
2. 将拍摄间隔设置为“最短”不会导致最终补偿失调。相反，几乎每次3秒的拍摄间隔都会导致失调。我尝试过多次并确认了结果，但只适用于我的情况。
3. 使用PixelShift2DNG应用程序合成DNG文件非常简单，可以合成单个240 MP DNG。但它不能执行独特的算法，也缺乏运动补偿。这意味着你无法控制中间处理过程。请确保在拍摄过程中没有失调。
4. RawTherapee像素移位算法显着提高了照片的整体质量。例如，RawDecoding模块可以解决由锯齿状像素引起的异常色散，并且CaptureSharpen模块极大地增强了分辨率。此外，RawTherapee提供了自动的运动对象掩模校正补偿。这取决于提供包含16个RAW数据文件的单个ARQ。
5. Sony的软件可以快速合并ARQ文件。它们将16个ARW文件打包在一起。ARQ文件可以解码并准备好PixelShift2DNG和RawTherapee使用。你可以将ARQ格式视为归档格式。
6. 如果你获得了一张合适的16张照片合并的照片，则最终分辨率会显着提高，超过60 MP。按我的视觉估计，它至少达到了100 MP。
7. 4张合并的照片对分辨率影响很小，基本上只用于修复60 MP缺失的色度信息。除非是条纹状图案，否则视觉上的改进很难观察到。
8. 5秒长时间曝光不会导致异常的合成结果。
9. 合并4或16张图像后，动态范围显着提高。合并4张照片至少可以比单张照片提高1 EV的动态范围，并且合并16张图像的动态范围提高大于合并4张图像，并且还可以更干净地恢复低曝光阴影。
10. 在实际应用中，你可以使用16张合并来提高分辨率。除非需要消除莫尔条纹图案，否则合并四张图像的意义有限，但对于提高动态范围非常推荐。
11. 对于16张合并模式，F4是最佳光圈，F5.6开始出现衍射效应。