Note: if you choose Point/Pica Size, choose from the following options: On the top left corner of the info, panel click the menu button and choose Panel options from the menu that appears.Ĭhoose the unit of measurement that you want then click Ok to confirm or Cancel to exit without committing changes. If it is not there go to Window then Info or press F8. You can also change the unit of measurement from the Info panel.Choose the unit of measurement that you want then click Ok to confirm or Cancel to exit without committing changes. The Preferences window with the Units options will appear. You can also go to Edit then Preferences then Units and rulers.Double-click any of the rulers, and the Preferences window with the Units options will appear.To change the unit of measurement of the ruler do any of the following: Whatever the case may be, you would want the option to be able to change the unit of measurement. Change the unit of measurementĪ document you are working on may ask for a specific unit of measurement or you may be more comfortable working with a specific unit of measurement. You will see the crosshair and some lines appear as you drag, wherever you stop will be the new zero origin. This method of setting the zero origin will require you to put the cursor at the top left of the screen where the rulers meet, you will click and drag the cursor diagonally toward the canvas.This snaps the ruler origin to guides, slices, or document bounds. Choose View > Snap To, then choose any combination of options from the submenu.There are two ways that the zero origin of the ruler can be decided. To reset the zero origin to the default, double-click the upper left corner where the rulers meet. Note that whenever you open a new document, the default zero origin will return. The default zero position of the ruler is usually at the left edge of the document. Changing a ruler’s zero originĬhanging the ruler’s 0 origin means changing the position where the starting point (0) for measurement on the ruler is. The guides along with the ruler can help to align objects on the screen accurately. If you click and drag from the ruler to the canvas, you will get guides. The ruler is accurate and can be used to get the measurement of objects and the distance between objects in the work area. Whenever you move the cursor in the work area you will see marks moving on the rulers showing the position of the cursor on the screen. both options will toggle the Ruler on and off. If the ruler is not visible, you can go to the top menu bar and press View then Ruler or press Ctrl + R. The ruler is usually located at the top and left side of the work area. The Ruler tool is located on the left tools panel in the same tools group as the Eyedropper tool, the Color sampler tool, and the Note tool. The Ruler tool helps you position images and elements precisely. When the rulers are visible, they are usually at the top and left of the work area. The Ruler tool helps you to position elements accurately in the work area. So we do some quick division: 157529/152.374 and we get 1033.Photoshop has Ruler and the Ruler Tool. So we know that one square meter is 152.374px and our selected area is 157,529px. Change the “Source” dropdown box in the Histogram window to Selected Layer and write down the number under Pixels. If it doesn’t have the numbers underneath it, click the drop down box in the top right hand corner of it and go to Expanded View.Ĥ. Go to the Window Menu and bring up the Histogram. Set the tolerance to 1 and untick Antialias and Contiguous (it should select everything you’ve painted).ģ. Use the Magic Wand Selection Tool to select the area you just painted. Make sure you set the brush to have a hardness of 100%.Ģ. Make a new layer, and using a wonderful bright colour, paint over the area you want to calculate the size of. This gives us 12.344 pixels per meter and if we square it we get 152.374px per square meter. So from this we can work out that there’s 246.88 pixels in 20 meters. In the ruler tool options (top of the screen usually), make sure “Use Measurement Scale” is unticked. Use the Ruler Tool in Photoshop (hidden under the eyedropper tool) and select the distance for your scale.ģ. If you’ve got a scale marker on your map, use that, otherwise you’ll need to measure a distance that you know, in this case I used a basketball court (marked as 20mx33m).Ģ. In this guide I’m using Photoshop CS5 for Mac, most of the concepts will be similar for the other versions.įirst up: Scan your map and get it into Photoshop Working out the Scaleġ. Here’s a quick guide I wrote on how to use Photoshop to easily measure an area on a Map using Photoshop.
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