PNG TO TIFF Conversion with Transparency

[Gokhan]

Hi;

I am trying to convert a png image with transparency to a TIFF file. After this conversion i am having black background on each channel as it shows on Adobe CS4 but is shows correct on Adobe CS5 (Also image editor applications such as Picasa shows a black background)

Code: Select all

%CONVERTEXE% %IMGINPUTDIR%\%INPUTFILE%  -type truecolormatte +compress  %IMGOUTPUTDIR%\%OUTPUTFILE% 

i am suspicious about color palette and depth as when i compare "Photoshop CS4 PNG to TIFF" and "IM 6.7.0 PNG to TIFF" . i see this

Photoshop CS4
----------------------------
Depth: 8/16-bit
Channel depth:
red: 16-bit
green: 16-bit
blue: 16-bit
alpha: 8-bit


IM 6.7.0
---------------------
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
alpha: 8-bit






i have seen couple threads on here bur sadly no solution yet. Any advice?

Thank you

[fmw42]

Post a link to your PNG file so others can test/check it.

You seem to be running IM in default Q16 mode. If you want 8-bit per channel results add -depth 8 to your command.