Low quality images when imported into LabVIEW

[Basjong53]

I want to use a tree control with custom symbols. I have prepared some png images to be used:

 

 

 

They look fine here with the native resolution of 16x16. They are created in Adobe Illustrator and exported as png with a resolution of 72 ppi.

When I read them into Labview and displayed in a picture they come out with very low quality:

It seems like anti-aliasing or transparency is removed or something. Changing the Transparency Thres input of the Read PNG File.vi doesn't do the quality any good.

How can I get the same quality as the actual images in LabVIEW? I have attached the images.

    

[cordm · Accepted solution]

Use vi.lib\picture\PNG\Draw Flattened Blended Pixmap.vi

(found out about it here: Create pictures with different opacity levels, there since LV2020)

[dexteko1]

I succeeded to have the result from the video only by wiring the 24-bit pixmap to the Convolution.vi that I called only once with Y input {0 -1 0} {-1 4 -1} {0 -1 0}

[AeroSoul]

can't download the files (probably need to be registered to lavag?)

[Basjong53]

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@cordm  ha scritto:

Use vi.lib\picture\PNG\Draw Flattened Blended Pixmap.vi

(found out about it here: Create pictures with different opacity levels, there since LV2020)

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Thank you, this function works great to get the images on a picture control. However, I want to have these images as symbols for a tree control. Setting the raw png image data as the custom symbols still gave the low quality symbols.

I found the solution however by converting the image data to pixmap using the "blended pixmap.vi" and converting it back to image data:

Now the symbols look great!

[maxnoder1995]

I didn't really understand the difference between the two. When should I use Draw Flattened Blended Pixmap.vi and when should I use Draw Flattened Pixmap.vi

[cordm]

Be aware that Picture to Pixmap cannot export alpha channel information. The image is blended (as the name suggests).

So if your particular tree cell has a different background color, you would need to create a filled rectangle with that color. Otherwise, you get your symbol on a white box on a green cell.

[cordm]

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@maxnoder1995 wrote:

I didn't really understand the difference between the two. When should I use Draw Flattened Blended Pixmap.vi and when should I use Draw Flattened Pixmap.vi

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If you have a png with an alpha channel, the background will shine through. With Draw Flattened Pixmap, you get 1-bit transparency: either fully transparent or fully opaque.

A gradient from red to fully transparent will look like this (front panel set to white background):