topic Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg, in ArcGIS Enterprise Questions

“Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Sun, 14 Jul 2019 19:48:52 GMT

“Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

I’m not sure if there is a tool that can convert ecw rasters of 4 bands to jpg.

Thank you

Jamal

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

LanceCole — Sun, 14 Jul 2019 23:12:19 GMT

Jamal,

Check Supported raster dataset file formats—Help | ArcGIS for Desktop - JPG only supports 1 or 3 bands. You could try JPEG 2000 or TIFF

If the issue persists, try to convert the ECW to a TIFF then convert the TIFF to a JPEG 2000. If I remember correctly, depending upon the ECW version, not all color maps are supported in direct ECW to JPEG 2000 conversion.

Also, make sure you are using 8-bit unsigned integer as your data type.

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Sat, 20 Jul 2019 11:30:43 GMT

Thank you Lance Cole for the input.

Unfortunately, jpg2000 of 4 bands can’t be converted to jpg

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

LanceCole — Sat, 20 Jul 2019 13:38:11 GMT

Jamal,

Correct, JPG only supports 1 or 3 bands as noted in my original post. It does not support 4 bands. If you need to support 4 bands, you will need to work with TIFF or JPEG 2000 or convert using only 3 bands to use JPG.

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Fri, 14 Aug 2020 06:53:04 GMT

Thanks Lance.

Then how to convert the ecw of 4 bands to jpg (that only supports 3 bands)?

By the way, does converting a raster of 4 bands to 3 bands affect the visual context? Is visually a raster of 4 bands clearer than the one of 3 bands?

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

LanceCole — Fri, 14 Aug 2020 10:20:56 GMT

Good Morning Jamal‌,

You should be able to use the Composite Bands Tool (Data Management) to create a raster dataset containing subset of the original raster bands. I am currently working from a mobile platform so cannot create a walk through for you.

Most applications, such as ArcGIS, only display 3 of the 4 bands at any one time with multi-band imagery. Normally the 4 bands are based upon light wavelength of red, green, blue, and near Infrared or Infrared. If you look at Landsat imagery there are typically 7 bands or hyperspectral image can have many more bands in discrete wavelength groups. The default is to display RGB, typically bands 3, 2 & 1 but you can change this in your image settings depending upon what you are doing with your imagery. For example, if you replace your red band with the near IR band, the image will look nearly the same but bodies of water will be very dark and easy to identify. Here is a listing of Landsat band combinations just for reference.

Lance

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Fri, 14 Aug 2020 11:40:04 GMT

Thanks Lance.

I applied the “composite bands” tool and found out that it has nothing to do with the number of bands of a raster. The output is a raster of same number of bands.

I thought that this tool will convert a raster of 4 bands into a raster of 3 bands

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

LanceCole — Fri, 14 Aug 2020 13:56:34 GMT

Jamal,

You should be able to specify a subset of the original bands with Composite Bands. You may need to add each band to the tool or it may be in the Environment settings. I do not have access to ArcGIS today to provide more details and I am doing this from memory. You can also use Extract Bands Function (Desktop) or Extract Bands Function (Pro).

Lance

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Sat, 15 Aug 2020 09:53:44 GMT

Not sure why the “extract bands” tool is not populated!

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

DanPatterson — Sun, 16 Aug 2020 09:12:00 GMT

Because if you read the help topic you will see it is a fumction not a tool

Extract Band function—ArcGIS Pro | Documentation

More information

Raster functions—ArcGIS Pro | Documentation

and it will make a folder so it is best if your project is in a folder

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Sun, 16 Aug 2020 19:29:53 GMT

I couldn’t figure out where the output of the “extract band” raster function is saved

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

DanPatterson — Sun, 16 Aug 2020 20:34:01 GMT

You missed this in the help... first line

Raster functions are operations that apply processing directly to the pixels of imagery and raster datasets, as opposed to geoprocessing tools, which write out a new raster to disk.

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Mon, 17 Aug 2020 20:00:27 GMT

There is no clue where the result is saved.

The “Extract Bands_MOLG_2018_ITM_36_14.ecw” doesn’t appear in the folder that contains “MOLG_2018_ITM_36_14.ecw”.

The original “MOLG_2018_ITM_36_14.ecw” still has 4 bands

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamesBurn__LET__C_E_T___GISP__ — Mon, 17 Aug 2020 23:18:48 GMT

I believe that once you have completed running the function, the newly created image is held in memory. So you'll need to right click on it and "export" to wherever you would like to save it. I believe at this point there is also the option of the format so, back to your original question, you could save it as a 3 band jpg. You may want to use some caution though - if the original file is an ECW, it may be compressed which could lead to a potentially large jpg (or tiff etc.)

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

JamalNUMAN — Tue, 18 Aug 2020 05:23:15 GMT

Thanks James.

Re: “Raster to other format” tool fails to convert ecw rasters of 4 bands to jpg,

LanceCole — Mon, 26 Sep 2022 12:35:52 GMT

Follow-up. I revisited this post today as I needed to process some 4-band TIFFs to 3-band JPG and noted I never uploaded a screenshot clarifying utilizing the Composite Bands Tool (Data Management) with a subset of the original imagery bands. To complete this, one needs to add each required band to the tool rather than just the image itself, as depicted below. Although I am using a TIF, an ECW file would work the same way.

Additional parameters can be specified on the Environments tab, such as compression, reprojection, etc. Python or ModelBuilder can be utilized very efficiently if multiple files need to be processed.