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“Raster to other format” fails to work properly and make the jpeg output raster dark

lubnajarara_ah

Hi All,

I couldn’t figure out why “Raster to other format” tool make the jpeg output raster dark?

I used “Raster to other format” tool to convert tiff- 8 bit unsigned raster to jpeg and the result was dark raster.

What might be the issue here?

The raw data is here

Best,

Lubna

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DanPatterson_Retired

what is the nodata value? resample method? The "environments" tab for the tool allows you to set the raster parameters prior to running the tool

Raster To Other Format—Conversion toolbox | ArcGIS Desktop (same in arcmap)

2.png

lubnajarara_ah

Hi Dan Patterson

The below is information of the output raster.. What do you thing ?

What do you suggest to do

Thanks in advance

Best,

Lubna

DanPatterson_Retired

The problem is the symbology.

In the original, class 0 is the black lines work and text, class 1 is white.

I converted to a jpeg, but used "unique symbols" in symbology (not stretched!) and symbologized the class 0 as black and class 1 as 'no colour'. If you wanted to you could Reclass the raster so that class 0 is 1 and class 1 is nodata.

So in short... there is nothing wrong with the conversion, it is the symbology and the fact that 0 and 1 are switched from a conventional binary representation (eg 0 as nodata and 1 as data)

DanPatterson_Retired

As an after thought... the color ramp you are using goes from black to white.... you could always just flip the colour ramp

lubnajarara_ah

Hi Dan Patterson,

I tried the both suggestions that you had mentioned, but unfortunately, they are not working with me!

In my case, I have more than 100 georeferenced raster that I need to change them to jpeg to add them into a mosaic, so I don’t need to change the color of the raster at the level of sympology

I will be very appreciated for any help regarding this

Best,

Lubna

LanceCole

lubna jarara'ah‌,

Looking through your correspondence with Dan Patterson‌ I noted your output JPG is 8-bit not 1-bit. I also noted the value range is 0 to 2 not 0 to 1. Just out of curiosity try setting No data value in the image Symbology to 0, 1 and 2 individually to see if this helps at least with the display. This will not fix the image but possibly display the image correctly.

Rerun the Raster to Other Format tool but in the Environment Settings > Raster Storage section, 1) under pyramids - turn off Build pyramids. 2) under Raster Statics - turn off calculate statistics. 3) under compression use a B&W method such as RLE or one of the CCITT methods. Click run. I am not where I can test this at the moment.

lubnajarara_ah

Thank you for your help Lance Cole

I tried your suggestions. Unfortunately, it is not working well with me

I used the Irfan View software that you had suggested to me in another issue and it works like a charm and convert the tiff to jpeg successfully but I add 2 steps to keep the georeference of the raster by define the projection of jpeg raster and rename the .tfwx file to be .jgw and everything works well with me

Best,

Lubna

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