ReadPIC

Read and write Biorad PIC image files

Description

Allows you to read, write, and get information about Biorad PIC image files. The function can be used by themselves or incorporated into the image formats accessible with imread, imwrite, and imfinfo using:
imformats([imformats struct('ext', {'pic'}, 'isa', @ispic, 'info', @impicinfo, 'read',@readbmp, 'write', @writebmp, 'alpha', 0, 'description', 'Biorad Image File (PIC)')]);

• MATLAB release: MATLAB 7.5 (R2007b)

[Gregory Jefferis]

Useful submission - many thanks. However there is a bug in writepic that is causing all image data to be shifted by 1 or 2 pixels. Specifically the header should be 76 bytes long but it is currently being written with 74 bytes. That means that the first 2 bytes of image data are lost. Then the writer adds 2 0 bytes at the end of the image. I'll submit a patch as another comment.

[Gregory Jefferis]

From 6271626b74e8dbca7ae4d6ea08b7358d76323f72 Mon Sep 17 00:00:00 2001
From: Gregory Jefferis <[e-mail]>
Date: Tue, 1 Jun 2010 03:52:20 +0100
Subject: [PATCH 1/2] Fix bug in writepic resulting in image data off by 2 bytes

* was resulting in 74 rather than 76 byte header
* then appending a spurious 2 bytes after image data
* net effect is that all pixels were displaced by 1 or 2 pixels
---
 ReadPIC/writepic.m | 4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/ReadPIC/writepic.m b/ReadPIC/writepic.m
index 400f528..2f3281d 100644
--- a/ReadPIC/writepic.m
+++ b/ReadPIC/writepic.m
@@ -44,14 +44,12 @@ fid = fopen(filename, 'w');
  fwrite(fid, [tempFileName(1:min([end 32])); zeros(32 - length(tempFileName), 1)], 'char');
  fwrite(fid, [0 7 12345 0 255 7 0], 'int16');
  fwrite(fid, metadata.LensMagnification, 'int16');
- fwrite(fid, metadata.LensFactor, 'int16');
+ fwrite(fid, metadata.LensFactor, 'float');
  fwrite(fid, [0 0 0], 'int16');
 
  % write image data
  fwrite(fid, X, ['uint' sprintf('%0.0f', metadata.BitDepth)]);
 
- fwrite(fid, 0, 'int16');
-
  writeComment(fid, ['PIXEL_BIT_DEPTH = ' metadata.BitDepth])
  writeComment(fid, 'PIC_FF_VERSION = 4.5')
 
--
1.6.3.3.334.g916e1