Skip to main content
Question

Rastermosaicker adds data (0,0,0)

  • October 3, 2017
  • 2 replies
  • 21 views
salvaleonrp
Enthusiast
Forum|alt.badge.img+20

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?

This post is closed to further activity.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.

2 replies

daveatsafe
Safer
Forum|alt.badge.img+19
  • daveatsafeSafer
  • Safer
  • 1637 replies
  • 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.

geospatiallover
Participant
Forum|alt.badge.img+6
  • geospatialloverParticipant
  • Participant
  • 70 replies
  • October 3, 2017

@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?

Community Stats

32,093
Posts
121,875
Replies
39,731
Members

Latest FME

Terms & ConditionsCookie settingsAccessibility statement
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.