7

ProphotoRGB is the color space which defines the gamut. This RAW file size is controlled by the color depth (such as 14 bit). A 14 bit depth is the same size in AdobeRGB and ProphotoRGB. A jpg is 8 bit regardless of gamut chosen.


5

Let me first say that everything that's happening is exactly how it should be. Even the fact that Photoshop gives you a warning, which is a matter of its Color Settings (see below). And your concerns are absolutely valid. In a TL;DR fashion, I'll say this: only use a non-sRGB profile if: You have a colour-calibrated monitor (and, in fact, the whole ...


4

The ProPhoto colorspace cannot be displayed in its entirety. According to Wikipedia: One of the downsides to this color space is that approximately 13% of the representable colors are imaginary colors that do not exist and are not visible colors. ProPhoto is useful as a working colorspace when the full gamut contained within images needs to be preserved. ...


4

In Adobe Photoshop, there are two menu options: "Assign Profile" and "Convert to Profile". If you have an image in the ProPhoto RGB color space, and you "assign profile" sRGB, this just changes the metadata in the file as to which colour space the RGB values refer to. It will give you the effect you want. If you were to select "Convert to Profile", this ...


4

All other things being equal, saving file in ProPhoto instead of sRGB or AdobeRGB shouldn't increase the size. But ProPhoto files should be always saved in 16 bit color to avoid posterization. Compared to 8 bit workflow with sRGB the files are larger...


2

It depends on your intended purpose. If your output will be on typical screens (monitors, phones etc) then sRGB is going to get you the best most consistent colour accuracy. ProPhoto RGB has a wider colour gamut and so is technically better but you would only see the benefits if you are outputting to a medium that uses that colour range such as high quality ...


2

An RGB image stores, for each pixel, an R value, a G value and a B value, which combine to define the colour of that pixel. Using 16 bits per channel (for example) allows for 281 trillion distinct colour possibilities for each pixel. This takes up the same amount of storage space regardless of the colour space of the image, whether it's sRGB, Adobe RGB, ...


2

Zeus's answer is great and comprehensive. I am just going to add some additional thoughts for some of the OPs specific questions. Some below are opinionated based on PRACTICAL REALITY and experience. Avoid ProPhoto in Practice I normally recommend NOT using ProPhoto. It is an ESPECIALLY bad choice for someone just starting out. And it is a particularly bad ...


2

Just because Photoshop uses the ProPhoto color space internally, it doesn't mean what you see on your screen is rendered using ProPhoto color space. It's almost certainly being converted to sRGB when sent to your screen. So what you see on your screen when working in the ProPhoto color space is the results of your processing instructions applied in ProPhoto ...


2

I think there's a broad misconception here, but I'm not sure where to start to 'fix' that, so here are some rambling thoughts so far… Bullet points in the question have been edited since I answered this, so my numbers no longer match the question. The broad scope is still the same. I tested the images from the linked website in four browsers, Left to right ...


2

The ProPhoto color space is just another way of describing RGB colors. sRGB, AdobeRGB, and ProPhoto can all describe/display the same colors (where they overlap/using different numbers); but the larger color spaces can describe/display colors the smaller spaces cannot without using negative values. But just because a color space can describe a given color ...


1

on PS (with "convert to profile..." and "assign profile") that doesn't work and actually looks the same on PS and of course renders different on the browser. And with the same resultant image I tried to convert it back to proPhoto Actually, convert to profile is working correctly. It should look the same in a program that recognizes and ...


1

You can see them anywhere really. To get the most accurate view, they have to be converted to the colorspace of the output device, otherwise you will see a very flat and dull looking image. ProPhoto RGB images do not contain all colors from that color-space but are allowed to contain colors that cannot be represented by other more narrow ones. The point of ...


1

I don't see any real issue with your process; except that the third step is redundant and destructive. Try turning on your color space warnings in PS's color setting preferences and then opening one of your exported images... see if PS throws a color space warning telling you that the image is in sRGB or not. If it does throw the warning (it should) then you ...


Only top voted, non community-wiki answers of a minimum length are eligible