Can LabVIEW save a 16 bits image

[Bojui]

Hi,

I want to save a 16 bits image using LabVIEW or Imaq. I realized that there were some discussions about this issue, i know that I can only save the 16 bits image in a tiff format. So, let's say i need to save the 16bits image in a tiff format and it seems that LabVIEW program can't do this but Imaq can. So, i use Imaq. I did a simple test, i create an 2D array has a size of 256*256, and the value in the array is between 0~65280. So, if I want to save this array as a image, i need to save them into a 16 bits, tiff format. I saved it using IMAQ Write TIFF file.vi. Then I opened the image file with ImageJ program, and I found the histogram is between 32768~65535, not 0~65280. I created another image again, with the value between 0~32640. Then I opened the image with ImageJ again, and i found the histogram is between 32768~65408, which are exact the value of 0~32640 add by 32768. As a matter of fact, I tried creating several images and found that when I saved them into 16 bits, tiff format by using IMAQ Write TIff file.vi, the bit depth always add by 32768.

So, is this the default setting of LabVIEW? Can I change it? How to save an array exactly to a 16 bits image, without adding another 32768 into its bit depth? besides, adding another 32768 bit depth means that i can only save an 15 bits array, not 16 bits, right?!

Best, Bo-Jui

[gregstoll]

Bo-Jui -

Just as a side note, the AIPD, JPEG2000, PNG and TIFF formats all support writing an I16 image.

Unfortunately, as you've discovered, signed pixel formats such as I16 aren't always handled correctly/easily with other image editors.  The good news is that NI Vision 8.6, which should be released shortly, does contain support for Image Management functionality (which includes reading/writing to file) for unsigned 16-bit images, which will hopefully clear up the problems you've mentioned.

Greg Stoll
Vision R&D
National Instruments

[muks]

---

The good news is that NI Vision 8.6, which should be released shortly, does contain support for Image Management functionality (which includes reading/writing to file) for unsigned 16-bit images, which will hopefully clear up the problems you've mentioned.

---

That is one grt news .