Ask Your Question
0

Trasforme GRAY2RGB

asked 2014-04-30 10:08:55 -0500

hafidhfhh gravatar image

plzzzz hel

plzz help me how to transforme image grayscale to RGB

function cvtColor(.,.,GRAY2RGB); don't work pfff plz help me how to do this in opencv C++ visuel studio 2010

edit retag flag offensive close merge delete

2 answers

Sort by ยป oldest newest most voted
1

answered 2014-05-01 02:29:36 -0500

I do think both suggestions contain wrong information. To make it a little more clear look at the link that @FLY provided right here. If you go down to the cvtColor function and to the grayscale to rgb conversion you will see the following statement.

Gray to RGB[A]: R <-- Y, G <-- Y, B <-- Y, A <-- \max(ChannelRange)

Here comes in play directly what @Allyson Martins suggested. When you got a grayscale image you only have intensity values from 0 - 255 of each pixel. You have basically no idea how the relation of green, blue and red is in that specific pixel.

So you either have to

  1. Define a relation between the channels and use that to backproject the colors
  2. Or you do like openCV and take the same intensity values for each channel. This will look like a grayscale image but in fact it is not! You changed from the 8UC1 type to 8UC3 type thus having three color values, just all the same weight, resulting in a grayisch colored color image.
edit flag offensive delete link more
0

answered 2014-04-30 13:49:23 -0500

You cant simply convert gray to rgb. You need to make a mask to do it. The computer needs to know what are the colors of the image in RGB scale to convert.

edit flag offensive delete link more

Question Tools

Stats

Asked: 2014-04-30 10:08:55 -0500

Seen: 2,072 times

Last updated: May 01 '14