topic Re: can pics taken with white balance set to b&w be converted back to color? in EOS DSLR & Mirrorless Cameras

can pics taken with white balance set to b&w be converted back to color?

mwebsurfer — Sun, 18 Oct 2015 02:04:00 GMT

took 28 pics with white balance on b&w with T5I. Is there a way to comvert them back to color?

Re: can pics taken with white balance set to b&w be converted back to color?

RobertTheFat — Sun, 18 Oct 2015 02:16:44 GMT

If the pictures were taken in RAW mode, open them in a good editor (e.g., DPP or PS). You should be able to change the WB setting back to "Auto" or to one of the color values.

If the pictures were taken in JPEG, you're probably out of luck. There's no going back, because the necessary information wasn't saved.

Re: can pics taken with white balance set to b&w be converted back to color?

ScottyP — Sun, 18 Oct 2015 15:13:04 GMT

Exactly. One more reason to shoot in RAW.

Rather than locking yourself into something like that, just shoot in color in RAW and you can decide in post processing whether you want to do color or B&W. With JPG your ability to fix bad white balance is limited and attempts to push WB or exposure changes too far in a JPEG result in some ugly ugly images. Even a less extreme WB change, like daylight to shade is dicey with a JPG. Because I am imperfect and I regularly forget to change my WB when I walk into different light I will not shoot JPG.

Re: can pics taken with white balance set to b&w be converted back to color?

ebiggs1 — Mon, 19 Oct 2015 15:45:46 GMT

If this image were RAW, the color might still be there. Might be! But since it is JPEG, it is not. The RGB format for each pixel is set to a gray scale value. That is, they're all just levels of gray. 256 levels to be exact.

When the image was mapped to 256 gray levels, all the original color information was irreversibly lost.

JPEG is a destructive process. It is a lossy compression scheme, which means it is a one-way process. It is impossible to reconstruct what was deleted. There are some methods, that will asign color to a specific gray scale level but it is not easy or fast.

Re: can pics taken with white balance set to b&w be converted back to color?

ebiggs1 — Mon, 19 Oct 2015 15:56:15 GMT

When you shoot and save raw files the camera makes a header file which holds all of the camera settings, such as sharpening, contrast, saturation, colour temperature, I.E., white balance, etc. The image is not changed at all by these settings, it is simply tagged onto the raw data. You can not view a raw file without the meta data file. The raw converter, like ACR9, uses this meta data file to construct a viewable picture on your screen.

This raw data, exactly what the sensor recorded, along with the tag file, called the meta data is saved to the SD card. It is done losslessly so there is no deterioration of the file due to compression, with Canon cameras anyway. Brand-N does do some lossy compression to their raw files.

Re: can pics taken with white balance set to b&w be converted back to color?

theandies — Mon, 19 Oct 2015 20:59:48 GMT

I shoot RAW+JPEG. JPEG to have easily opened photos on other devices and programs and RAW to do post processing if I want to. It might be over kill but I like the versitality. Most of my shots get the DELETE treatment anyway. LoL