Legacy ImageMagick Discussions Archive

That's a bummer. Do you know if IM can extract the additional channels at all?

So i have a simple PSD with a single layer and RGBA channels. Running a simple convert should result in an RGBA tiff right? However i just get and RGB tiff, the alpha channel has been lost. I've tried the -define tiff:alpha options and all produce the same result. convert input.psd[0] output.tif inp...

Hello, i'm trying to use IM to resize images as its has some better options than PS. However if I have an RGBA TIFF and a simple: convert.exe source.tif -resize 1024x1024 dest.tif Will essentially "bake" the alpha channel as transparency into the tiff and remove the alpha channel. I've tri...

Awesome information! Thanks for looking into this, very helpful

https://docs.google.com/folder/d/0B2MGMFzV11wXT09jSEkyZkp0Snc/edit Here are two images: * color1.tif is the source, it's desaturated but has 3 channels * _color1.tif is the result from PS. Simply changing the mode to Grayscale. In photoshop they look the same So I tried running compare against these...

Ok so i did convert.exe color1.tif -colorspace sRGB -modulate 100,0,100 -set colorspace RGB -colorspace Gray __color.tif And in PS the result looks slightly lighter than the target. So i used compare as you did and i get: 0.645167 (9.84462e-006) So does that mean PS is just displaying it wierd and t...

was the resulting image grayscale or rgb?

convert.exe color1.tif -colorspace sRGB -define modulate:colorspace=HCL -modulate 100,0,100 -set colorspace RGB __color.tif convert.exe color1.tif -colorspace sRGB -define modulate:colorspace=HCL -modulate 100,0,100 -set colorspace RGB -colorspace Gray __color.tif These result in the same image that...

turns out a little brighter. For this particular image if i use -modulate 83,0 it gets super close, but there is still a discrepancy.

I have no idea how PS achieves this. So i may just end up using PS to do the work.

im on the latest. My image to test is a simple gradient 512x512. In PS it's 3channel, but has been completely desaturated. Theoretically i just need to extract the r channel as they all should be the same, right? But in PS the resulting image from -separate looks darker than the R channel in PS. Is ...

So i have some images that are saved as RGB16 but actually have no color and should be saved as 16bit grayscale images. However when using imagemagick, it results ina darker grayscale image. If i leave colorspace alone, then it looks right, but is still RGB Ive tried the following convert image.tif ...