How To load Textures or Alphas From Lightbox
When I double click the alphas from Lightbox Images or loading directly to Spolight 
I want load images to brush alphas from light box… how can i do that
Hold Shift when you double-click. If you’ve a model in Edit mode you’ll find that the alpha gets assigned to the Smooth brush. You can avoid this happening by temporarily turning off Edit. The alpha will then be assigned to the current sculpting brush.
Holding down Shift while you double-click the item in LightBox will send it to the palette. But since holding Shift activates the alternate brush (Smooth by default), you’ll end up changing that brush rather than the current brush. You then have to disable the alpha or texture from the alternate brush and release shift. At that point you can then select the alpha or texture that you just loaded out of LightBox.
I’m checking with the team to see if there’s an easier way to do this.
By the way, holding Alt while double-clicking an alpha or texture will open it in the file type’s associated image viewer. For example, in Windows a texture will be opened in the Windows Photo Viewer while an alpha will open in Photoshop.
I see Marcus answered with the easier way while I was typing. 
Thank you very much friends…
Can they not think of a better way to do this rather than have to turn edit on & off?
Holding down an unused key would seem more sensible.
“I’m checking with the team to see if there’s an easier way to do this.”
Perhaps not forcing the user to hold Shift in the first place when all they want to do is select an image… Honestly, I should NOT have to spend 30+ minutes explaining to someone how your browser works and pitfalls to avoid.
THIS is the type of stuff that sooooooo many people are just not digging about ZB. The workflow/UI is just bad. There’s no other way I can put it. Lightbox is hands down the single worst browser I’ve ever had the inconvenience to use. However, rather than just bashing and being negative I’d like to take this opportunity to put forth some suggestions on what might potentially make it easier for users to interact with your software.
1.Make lightbox and all your other menus tearable on to a 2nd monitor. I’m pretty sure the vast majority of your professional user base has 2 monitors. We’d like to actually be able to use the 2nd one when using your software.
2.Whatever alpha you double click on is now the active alpha. No loading it up into another menu etc. Just double click or single click on it and now it’s active. You can adjust it, rotate it, radial fade it etc from the alpha menu (that is on the 2ND monitor). This menu should NOT become cluttered with a ton of alphas that you have selected. The user doesnt need to see all that stuff in the Alpha menu. Just the tools that affect the current alpha.
If anyone else would like to chime in feel free. Pretty sure it’ll just be crickets though.
actually the best workflow i can think of would be drag n drop support for lightbox.
drag and drop to alpha loads it to alpha.
drag and drop to texture loads texture.
drag and drop to canvas loads spotlight.
actual workflow is just veeery bad and makes no sense,sry.
cheers
Doesn’t work for me, when I double click, ctrl double click or shift double click, the alpha file always gets put into the Brush Texture field instead of the Brush Alpha field.
I have tried this with alphas that are .psd, .png and .tiff and all do the same thing.
And no I will not go into Photoshop to convert all my alphas to grayscale just because ZBrush is to stupid. These alphas work fine when I import them by hand, so there is no reason this shouldn’t also work
How do I get this damn alpha into the Brush Alpha field?
ZBrush 2022.0.1
EDIT:
So apperatelly the images have to be 8 or 16 bit Grayscale images so ZBrush loads them into the Brush Alpha field. Why does ZBrush decide for me, let the user decide: Maybe double click could put it into the Brush Texture field while a shift double click puts it into the Brush Alpha field.
There is however thankfully a way to do this in ZBrush, by clicking make alpha after it was put in the Brush Texture field .
This solution is still quite tedious. Especially when I will be having to repeat this process every time I restart Zbrush
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Just discovered the same issue. Thanks for the tip for making it work with greyscale images only but even with shift double click it only loads as texture…
I agree it should be a shortcut available to load it direcly into alpha channel of brushes.
Or simply offer a brush inside Zbrush similar to IMM only with alpha maps in pop up GUI with “m” key for quick selection. That should be an easy implementation right?