CODEWITHSUNDEEP
batch-filecmdimagemagick
Balázs Varga
Balázs Varga

Reputation: 1856

How to fade an image sequence into another in cmd with magick?

I'm new to the magick library and also this cmd syntax hurts me so much. I'm trying to achieve the following:

I have 2 folders, each of them contains 100 png files. I want to render a smooth transition between these images like this:

The first image in the first folder should be overlapped with the first image in the second folder with 1% opacity.

The 45th image in the first folder should be overlapped with the 45th image in the second folder with 45% opacity, and so on...

My files are named like frame000.png, frame045.png (padded with zeros), which is further complicates the problem.

I try to achieve this combining a for loop in a batch script and a magick command, but it seems like nothing is happening, when I run it it just prints this text to the cmd window 100 times:

SET NUM=x SET PADDED=00NUM SET PADDED=PADDED:~-3 magick composite -dissolve PADDEDPADDEDPADDEDPADDED.png

I think the problem is in my batch syntax, but I can't figure it out. Heres what I have in render.bat:

FOR /L %%x IN (0,1,99) DO ^
SET NUM=%x ^
SET PADDED=00%NUM% ^
SET PADDED=%PADDED:~-3% ^
magick composite -dissolve %x -gravity Center "frl1/frame%PADDED%.png" "frl2/frame%PADDED%.png" -alpha SET "output/%PADDED%.png"
pause

I tried changing the variable references to %x, %%x, %x%, but none of them gave me the correct results.

Upvotes: 0

Views: 144

Answers (1)

Stephan
Stephan

Reputation: 56188

your ^ means "Line continuation" - this is not how batchfiles work.

And you need delayed expansion:

Setlocal enabledelayedexpansion
FOR /L %%x IN (0,1,99) DO (
  SET PADDED=00%%x
  SET PADDED=!PADDED:~-3!
  magick composite -dissolve %%x -gravity Center "frl1/frame!   PADDED!.png" "frl2/frame!PADDED!.png" -alpha SET "output/!PADDED!.png"
)
pause

(Note: I removed an unnecessary variable)

Upvotes: 1

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