In meta-analyses, extraction of numerical data from graphs is commonly required it is however a challenging issue. On the other hand, disregarding such data may result in publication bias when conducting a meta-analysis. Contacting the authors in order to retrieve the data may take a long time and is often not very fruitful, because the research may have been performed so far in the past. In these cases, extracting the data from published graphs is a reasonable alternative. Here, we have described a simple method for extracting data from graphs using Adobe Photoshop.ĭata extraction from graphs using Adobe Photoshop. ![]() A, opening or importing a file B, cropping a graph C, locking a graph D, activating rulers E, choosing percent unit from context menu F, creating a horizontal measurement line G, finding the standard deviation/standard error of mean values.Ģ. Cropping the chart: “ Image” menu → “ Crop” → press “ Enter” to confirm the action ( Figure 1B).įor cropping, the rectangular marquee tool from the tool panel can also be used. It should be noted that cropping the chart has to be done carefully and the frame of the chart, exactly from beginning to end of the “y-axis” which displays a value (in Figure 1B this value is 400), should be selected.ģ. Locking the layer: “ Layer” panel → “ Lock” ( Figure 1C). This action is used to prevent further movement of the graph during the next process.Ĥ. Activating rulers: " View" menu → " Rulers" ( Figure 1D).įor activating rulers, pressing Ctrl + R also appears a ruler along the top and along the left hand side of the Photoshop canvas.ĥ. Choosing percent unit from context menu: Right click on the ruler → “ Percent” ( Figure 1E).Ħ.
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