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Photoshop CC: Is there a gauge that has some hash marks I can display?

I need to adjust image sizes manually for the rime being, since I do not yet know how to maintain aspect ratio on size reduction.

So, I need some measurement tool for the X and for the Y.

Does that exist?
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Grid and guides - https://helpx.adobe.com/photoshop/using/grid-guides.html

Grid Size is controlled in the Preferences.

Choose Edit > Preferences > Guides, Grids & Slices The Guides, Grids & Slices dialog box appears. In the Grid section choose a Color:, Style:, and Gridline Every: for grid spacing. You can even create Subdivisions for increased accuracy.

When you're satisfied, click OK.
NerdsOfTechTechnology Scientist
Commented:
You can scale the image preserving the aspect ratio. Under image size, choose percentage.

Here's a link on resize/resample:

http://www.photoshopessentials.com/essentials/resizing-vs-resampling/
curiouswebsterSoftware Engineer

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Commented:
thanks