Skip to main content
Question

Rastermosaicker adds data (0,0,0)

salvaleonrp
Enthusiast
Forum|alt.badge.img+15

My workspace created this QR code with a description below it was created by a rastermoasaicker from two png files - one for the QR and another one for the text below it.

The blue section with text extends by about 300 pixels more than the QR code - string length is up to 50 characters. When the raster mosaicker merges the two pictures together the nodata section of the merge is now replaced with black pixels. On RasterMosaicker, I tried "Overlapping Values: Last with Nodata Overwriting Data to No" and Overlapping Values: Maximum (255) and netheir one worked.

I prefer to have it white or no data. So far every thing I've tried has not worked yet. Any suggestions?

2 replies

daveatsafe
Safer
Forum|alt.badge.img+19
  • daveatsafeSafer
  • Safer
  • October 3, 2017

Hi @salvaleonrp,

In the ImageRasterizer that creates the text image, set Interpretation Type to RGBA32.

Use a RasterInterpretationCoercer to coerce QR image to RGBA32 before mosaicking.

In RasterMosaicker, set Overlapping Values to 'Composite Using Alpha Band'.

This will make all the extra pixels transparent.

G
Forum|alt.badge.img+5

@DaveAtSafe, after trying what you suggested, the pixels became transparent but the rasters did not merge. I'm back to where I was yesterday.

When rasters were merging, the QR code starts off as UINT8 with Band 0 and palette 0 (RGB24). The second PNG is 3 bands - Red8, Green8, Blue8) all with the value of 255 on the color black. I used the PaletteResolver on the QR code and the QR Code changed to 3 bands (Red8, Green8, Blue8) with Value 0 on black. This translation produced the merged but with the black square next to the QR code.

It's almost there. What else can I try?

Reply


Helpful Members This Week

Community Stats

30,985
Posts
117,432
Replies
38,764
Members

Latest FME

Terms & ConditionsCookie settings

Cookie policy

We use cookies to enhance and personalize your experience. If you accept you agree to our full cookie policy. Learn more about our cookies.

 
Cookie settings
A product of
Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.