Viewing Images with the Loupe

Aperture has a Loupe tool (also called the Centered Loupe) that you can position over a portion of the image you want to magnify. You can also position the Loupe off to the side of the image and have the Loupe magnify the portion of the image at the position of the pointer. Then, as you move the pointer, you see specific parts of the image magnified. The Loupe is useful for checking an image’s focus, as well as making quick checks for sensor dust, flaws, fingerprints on film scans, and other issues. You can use the Loupe on any image or thumbnail in the Aperture library.

Aperture also provides a second version of the Loupe for your convenience. For more information about using this alternate Loupe, see Using the Alternate Loupe.

To show the Loupe
Do one of the following:
  • Choose View > Show Loupe, or press the Grave Accent (`) key.

  • Click the Loupe button in the toolbar.

The Loupe appears.

Figure. Centered Loupe magnifying a portion of an image in the Viewer.
To hide the Loupe
  • Choose View > Hide Loupe, or press the Grave Accent (`) key.

  • Click the Loupe button in the toolbar.

Moving the Loupe

You can move the Loupe by dragging it to different locations over an image.

To move the Loupe
Do one of the following:
  • Drag the Loupe’s handle.

  • Drag within the Loupe.

    A circle appears that targets the area to be magnified.

  • Hold down the Grave Accent key (`) while clicking a specific place on an image.

    The Loupe moves to the part of the image you clicked.

Using the Pointer to Magnify Parts of an Image

You can leave the Loupe stationary and set it to magnify the portion of the image at the position of the pointer. Using the pointer to magnify the image is useful when you don’t want the Loupe to cover up the area of the image you want to magnify.

Figure. Centered Loupe magnifying the portion of the image where the pointer is positioned in the Viewer.
To use the pointer to magnify parts of an image
  • Choose Focus on Cursor from the Loupe pop-up menu.

    Figure. Loupe pop-up menu showing the Focus on Cursor command.

To turn off this feature, choose Focus on Loupe from the Loupe pop-up menu again.

Changing the Size and Magnification of the Loupe

You can change the size of the Loupe and increase or decrease its magnification level.

To increase the size of the Loupe
Do one of the following:
  • Choose View > Loupe Options > Increase Diameter, or press Shift–Option–Plus Sign (+).

  • Pull the grip on the Loupe’s handle out.

To decrease the size of the Loupe
Do one of the following:
  • Choose View > Loupe Options > Decrease Diameter, or press Shift-Option-Underscore (_).

  • Push the grip on the Loupe’s handle in.

To change the Loupe’s magnification by defined amounts
  • Choose a magnification level from the Loupe pop-up menu.

    Figure. Loupe pop-up menu showing magnification options.
To change the Loupe’s magnification incrementally
Do one of the following:
  • To increase the Loupe’s magnification, choose View > Loupe Scaling > Increase Zoom, or press Command–Shift–Plus Sign (+).

    Press these keys repeatedly to continue to increase magnification.

  • To decrease the Loupe’s magnification, choose View > Loupe Scaling > Decrease Zoom, or press Command-Shift-Underscore (_).

    Press these keys repeatedly to continue to decrease magnification.

  • To create smooth changes in magnification, place the pointer within the Loupe and roll the mouse wheel.

Displaying a Pixel Grid and Color Values

You can have the Loupe display the image as a grid of pixels that shows the actual pixel composition of the image, allowing you to see the individual pixel values at high magnification (400 percent or higher). You can also set the Loupe to display readings of the color values of the image, showing the RGB (%), RGB (8-bit), Lab, CMYK, HSB, or HSL values chosen for the Color meter.

Figure. Centered Loupe set to display a pixel grid and color values.
To set the Loupe to show a pixel grid
  1. Set the Loupe’s magnification to 400% or higher.

    For more information about setting the Loupe’s magnification, see Changing the Size and Magnification of the Loupe.

  2. Do one of the following:

    • Choose View > Show Pixel Grid in Loupe.

    • Choose Pixel Grid from the Loupe pop-up menu.

To turn off this feature, choose the menu item again.

You can turn on the display of Color meter values within the Loupe.

To turn on the display of color values in the Loupe
Do one of the following:
  • Choose View > Show Color Value in Loupe, or press Shift-Option-Tilde (~).

  • Choose Color Value from the Loupe pop-up menu.

To turn off this feature, choose the menu item again.

To change the color value option
  • In the Adjustments inspector or the Adjustments pane of the Inspector HUD, choose a color value option from the Adjustment Action pop-up menu (with a gear icon).

For more information about color values, see Using the Color Meter and Displaying Camera Information.

Using the Alternate Loupe

You can also use an alternate Loupe to examine parts of an image. You position the small ring of the alternate Loupe over the portion of the image you want to see, and the large ring shows a magnified view. It’s useful for making quick checks for dust specks, flaws, fingerprints, or other issues. You can use the alternate Loupe on any image or thumbnail in the Aperture library.

Figure. Aperture main window showing the alternate Loupe positioned over an image in the Viewer and displaying a magnified view of a portion of the image.
To show the alternate Loupe
  1. Do one of the following:

    • Choose View > Show Loupe, or press the Grave Accent (`) key.

    • Click the Loupe button in the toolbar.

  2. If necessary, choose View > Use Centered Loupe to turn off the display of the regular Loupe.

    The checkmark next to the Use Centered Loupe menu item disappears.

You can change the size of the alternate Loupe and increase or decrease its magnification level.

To reduce the size of the alternate Loupe
  • Choose View > Loupe Scaling > Decrease Diameter, or press Shift-Option-Underscore (_).

To increase the size of the alternate Loupe
  • Choose View > Loupe Scaling > Increase Diameter, or press Shift–Option–Plus Sign (+).

To increase the magnification of the alternate Loupe
  • Press Command–Shift–Plus Sign (+).

    Press these keys repeatedly to continue to increase magnification.

To decrease the magnification of the alternate Loupe
  • Press Command-Shift-Underscore (_).

    Press these keys repeatedly to continue to decrease magnification.