How to create jpg's from ARW (Sony RAW)?

Question

Hello!
I have Photoshop CS6 Extended.
Is it possible to create jpeg photos differing only by 1 EV basing on RAW
file automaticaly in CS6 (Camera RAW)?
I don`t want to open RAWs files every time I want to create a jpeg photo.
I have 3 RAW files: -2 EV 0 EV +2 EV
I want to create 13 jpeg photos at one time
- from 0 EV RAW file I want to create jpeg photos: -1 EV 0 EV and +1 EV
- from -2 EV RAW file I want to create jpeg photos: -6 EV -5 EV -4 EV -3
EV -2 EV
- from +2EV RAW file I want to create jpeg photos: +2 EV +3 EV + 4 EV + 5 EV
+6 EV
Is it possible to create such files at one time in CS6?

Answer 1

Question 1
To create a multipage tiff you use the method TIFFEncodeParam#setExtraImages. The method takes an iterator. I'm not sure if there is a built in way to append pages to an already existing file, but in theory you can read from the already existing file as needed (when iterator#next is called) and write to a temporary file, before replacing the existing file with the temporary one. So you'll still have to read the existing file, but you don't have to keep all the images in memory.
If you switch to core java's ImageWriter/ImageReader api and get [JAI-Imageio|https://jai-imageio.dev.java.net/binary-builds.html] (which has a TIFF ImageWriter plugin) then you can insert images into an already existing file. Presumably the TIFF ImageWriter appends directly to the file.
Question 2
The only thing special about a BufferedImage is that it has exactly one raster at (0,0) and it's guaranteed to have a color model. RenderedImages may have more than one raster and are not guaranteed to have a color model. But if your RenderedImage does have a color model, then you get rgb data from it the same way a BufferedImage does,
colorModel.getRGB(raster.getDataElements(x, y, null));There are other ways, but this is the most generic.