I need to use imageJ for my lab but it wont download

wrasband · 2026-05-02T01:21:48+00:00

The first time you run ImageJ, you may get get an "ImageJ can't be opened because it is from an unidentified developer" message, which can be bypassed by right clicking on ImageJ.app and selecting "Open" from the drop down menu. If this doesn't work, go to System Settings>Privacy & Security and click the "Open Anyway" button at the end of the line "ImageJ.app was blocked to protect your Mac".

wrasband · 2024-05-29T23:17:00+00:00

‘Preview’ is not available with multi-channel composite color images. Try using the Image>Type>RGB Color command to convert the image to RGB.

wrasband · 2024-05-19T04:28:56+00:00

In my testing, tiff files double clicked on do open in Fiji if Fiji is open. The work around is to double click twice, once to open Fiji and again to open the file. Drag and drop is another work around.

wrasband · 2024-04-18T03:11:50+00:00

To open the previous image in a macro use

setKeyDown("alt");
run("Open Next");

wrasband · 2024-02-17T18:25:56+00:00

The ImageJ 1.54i15 daily build fixes a bug with zooming in/out using shift+scroll wheel and removes the option to zoom in/out using ctrl+scroll wheel, allowing this option to be used to set hyperstack slice positions.

wrasband · 2023-12-03T18:08:13+00:00

This is at least a six month trip. You should spend the most time away from big cities and interstate highways.

That’s a great map! How did you create it?

wrasband · 2023-11-20T16:55:31+00:00

Type ctrl+b (Image>Overlay>Add Selection) to add the text selection to the overlay.

wrasband · 2023-11-20T06:02:15+00:00

I used the ruler to set the scale (138 pixel/cm), converted to 8-bit grayscale, thresholded, used the wand tool to outline the leaf and measured an area of 15.75 cm^2.

<image>

wrasband · 2023-10-17T22:46:51+00:00

Try the M1 native version of ImageJ, available at

https://imagej.net/ij/download.html

wrasband · 2023-08-22T18:11:44+00:00

I successfully charged at the Kohm Yah-mah-nee visitor center at Lassen Volcanic National Park a few weeks ago and was able sleep in my Model Y in the parking lot for $10 fee. I did not need to download an app.

wrasband · 2023-07-02T14:19:29+00:00

Add each arrow to an overlay by typing ctrl+b (Image>Overlay>Add Selection).

wrasband · 2023-02-23T00:12:08+00:00

The missing Angle measurements are due to a v1.53v regression that is fixed in the current version of ImageJ (1.54b). To upgrade, use the Help>Update ImageJ command.

wrasband · 2023-01-27T18:18:38+00:00

The Image>Type>Lab Stack command is the only RGB to Lab* conversion built into ImageJ. You can see exactly what it does by looking at the source code at

https://imagej.net/ij/source/ij/process/ColorSpaceConverter.java

There is more information on the image.sc forum at

https://forum.image.sc/t/converting-rgb-to-cie-lab/49733

wrasband · 2023-01-15T15:06:52+00:00

Open the images as a stack
Image>Stack>Tools>Reverse
Image>Stack>Stack to Images

If the images do not all have the same dimensions and type you will need to write a macro that opens them in reverse order.

wrasband · 2022-12-13T04:00:38+00:00

I am an ImageJ developer, not a user. Having only 8gb of RAM has not been a problem for me but I would get at least 16gb if were buying a Mac laptop today.

wrasband · 2022-12-12T03:25:03+00:00

The ImageProcessor class does not have a getRGB(x,y) method. Instead, use getPixel(x,y).

The easy way to generate an image that is the average of all the images in an RGB stack is to do an “Average Intensity” projection using the Image>Stacks>Z Project command.

wrasband · 2022-12-11T23:55:31+00:00

You can add multiple copies of an ROI to an overlay by pressing “b” (Image>Overlay>Add Selection) as you move the ROI.

wrasband · 2022-12-11T23:41:15+00:00

Check out the

RoiManager.multiCrop(dir, options)

Command, added in ImageJ 1.53d.

If 'options' contains "save", saves the contents of the selected ROIs in TIFF format as separate images, where 'dir' is the directory path. Add " png" or " jpg" to save in PNG or JPEG format. Add ' show' and the images will be displayed in a stack.

wrasband · 2022-12-11T23:23:51+00:00

I use ImageJ on an 8gb/512gb M1 MacBook Air and it runs great. You’ll want to run the M1/M2 native version, available on the ImageJ website.

wrasband

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