Horizon Straightener Needed

Ideas for improvements and requests for new features in XnView MP

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Horizon Straightener Needed

Postby KiwiB » Sun Mar 19, 2017 5:17 am

Personally I use Photoshop for editing, but I recently encouraged a friend to install XnViewMp as a replacement for his Picasa app. The lack of a horizon leveller was a deal breaker for him, and probably is for many other potential users of the app. The colour adjustments are very satisfactory for his limited purposes, but horizon adjustment is the other essential need for a basic editing suite.
Please consider this for your next update!
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Re: Horizon Straightener Needed

Postby m.Th. » Sun Mar 19, 2017 11:22 am

Eh...

Ok. I would be better. Much better IMHO.

...but he can do this now.

Steps:

1. Double-click on an image to open in Viewer
2. Edit | Crop (or press Shift + X)
3. Select an area around the "horizon" - take care to have an edge close to "horizon"
4. Go with the mouse NEAR to the one of the corners of the crop rectangle till you'll see a "rotating" cursor (like "Refresh"). Now you can rotate the crop rectangle.
5. Rotate & adjust till you have the margin exactly parallel with the horizon
6. Expand the margins of the rectangle as desired.
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Re: Horizon Straightener Needed

Postby helmut » Sun Mar 19, 2017 4:45 pm

For straightening an image I'd use custom rotation:

1. Viewer: Image » Rotate » Rotate...
2. Check [x] Show Grid
3. Check [x] Apply to image
4. Change the angle

Though this is a manual process and not an automatic straightening as requested.
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Re: Horizon Straightener Needed

Postby cday » Sun Mar 19, 2017 5:24 pm

helmut wrote:For straightening an image I'd use custom rotation:

1. Viewer: Image » Rotate » Rotate...
2. Check [x] Show Grid
3. Check [x] Apply to image
4. Change the angle

Though this is a manual process and not an automatic straightening as requested.

The problem with that method at present is that the angle adjustment slider is very sensitive, making it hard to make small angle adjustments without using the digital angle display which is slower. Reducing the sensitivity of the slider, or making the sensitivity adjustable in some way, could make precise angle adjustment much easier.

Out of interest, the program ScanTailor widely used for book scan processing has the following interface that allows really quick and easy fine angle adjustment:


ScanTailor_Rotate.png
ScanTailor_Rotate.png (111.25 KiB) Viewed 20 times


One or other of the blue circles is simply dragged to rotate the image, with a sensitivity that makes it really quick and easy to make accurate adjustments.

But refining the sensitivity of the slider in the existing custom rotation tool would be a good start...

Edit:

Looking at the XnView MP rotate tool in particular, the response to angle changes also seems very slow which makes adjustments even harder. The ScanTailor tool response is almost instantaneous which makes fine tuning really easy.
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