Gmic plugin zoom problem

I really like gmic and I use the plugin with On1PhotoRAW. When the photo loads the zoom says 43%. When I apply a filter the zoom goes to 100% and will not zoom out so I can see the whole photo. I have looked for input size settings and I have tried inputting in the zoom box but it reverts to 100% When I use a smaller resolution it works fine, and as it loads the full hi-res photo I can see it all but once I try a filter it is only able to zoom to 100% or more. Any ideas?
Thanks in advance.

@Crash Welcome to the forum!

The zoom behaviour depends on the filter’s code. If you cannot preview the entire image in the window, you could pan the image by holding a click and moving the mouse around. Let us know which filter is giving you problems.

In many cases, G’MIC preview does not display an accurate representation of your (un)filtered image. My pro tip would be to apply the filter and see what happens after processing in the host app. If you don’t like what you see, undo and change the filter’s parameters until you are happy.

I actually experience zooming problem too. This time, I’m sometimes restricted to 100%.

EDIT: It appears I can no longer zoom in via middle mouse.

Thanks for the tip. The zoom out button is greyed out on some filters so the idea of try and modify is good. The brushify filter looked good but it rendered a small area and passed it back to On1 at full resolution. It would look great as a print though.

Two things to say about this :

  1. There is one option in the G’MIC-Qt plug-in settings that let you “unlock” preview zooming:

gmic_zooming

  1. This is locked by default, basically because filter preview won’t be accurate when changing the defaut preview zoom factor (when unlocked). Indeed, each filter defines its own preview zoom factor, that tries to make the preview match the final result the best it can. This is already not that accurate by default for some filters, but be sure this won’t be accurate at all if you change the preview factor.

  2. Some filters allows you to change the preview factor even when in “locked” mode. Those filters provides generally a quite accurate preview. For other filters, “Preview” should be rather considered as an indication of what the filter does, not as the final result.

I have that on, and I still can’t zoom in with middle mouse wheel.

Works for me, on Ubuntu 20.04.
Will test on Win tomorrow.

I confirm also that preview zooming with the mouse wheel works also on G’MIC-Qt 3.2.1 / Windows.