Legacy ImageMagick Discussions Archive

It's a custom built mod that runs on top of Arma 3 engine to manage surface masks https://forums.bohemia.net/forums/topic/210105-surface-painter-a-simple-toolbox-for-map-makers/

It apparently uses the " Lossless Fast Pseudo-Quantization Algorithm " by Carsten Klein
https://sourceforge.net/p ...

Ok so I ran a 'identify' on both, could you please help me check what it so different which I might be able to fix with a revised command -

seems like my application is happy with a tif when the colormap is buffered out to 256 colours? - but are you able to preserve that from the source tif's ...

Thank you for your help on this snibgo by the way, i apologise as I am not familiar with image bit depth and colour profiles
I have been trying to read up on it here:
https://books.google.co.uk/books?id=6KVZ8Ya6a8cC&pg=PA72&lpg=PA72&dq=imagemagick+-type+palette+description&source=bl&ots=CgsUNiCNu1 ...

I'm after 8bit (indexed colour - 256 colours)

Type: Palette
Base type: TrueColor < **** does this mean that it's 24 bit? *****
Endianess: LSB
Colorspace: sRGB
Depth: 8-bit < ** regardless of this **
Channel depth:
Red: 8-bit
Green: 8-bit
Blue: 1-bit

I ran this command on all my append's ...

Even though the identify is showing "Depth: 8-bit", when I checked the final single image in irfanview it said it was back to 24bit
https://imgur.com/a/RnPab

I needed the final single image to be 8bit

So I had to decrease colour depth in irfanview to get it back to 8bit again
https://imgur.com ...

So here are the 'identify' details on the 4 images before I stitch them together with ImageMagick:

iow_1x1m_8bit.tif
Type: Palette
Endianess: LSB
Colorspace: sRGB
Depth: 8/1-bit
Channel depth:
Red: 1-bit
Green: 1-bit
Blue: 1-bit

iow_1x2m_8bit.tif
Type: Palette
Endianess: LSB
Colorspace ...

I have an application that requires input of 8bit lzw compressed tif files

the original images are 'bmp's' and are fairly large 40960 x 40960 - (aerial photography)

So handling them in Photoshop was not possible as a single image, I splice them into 4 tiles or 20480.

I needed to convert these 4 ...