Example of a bad resized image

General
1

Hi,

I was working with comics front cover, resizing them, yesterday when I falled on this one.


On left, the resized cover with Preview (OS X 10.8.5), on the right, resized using Xojo (current).

It also happens (similar to worst result) with some 2000AD cover scans.

PS: In a project, I generate five size (different names and usages, of course), two goes into two different folders created on purpose in the drop image folder. I automated the process as far as I can do, but if I have to do it manually… I will fall into a different bug (in an older application, I place the resized image in Image and its file name in RAW as text; and on some occasions, the text is cleared from the Clipboard…)

2

Is this on Windows? If so then this thread might help (solution at end of thread)…

https://forum.xojo.com/9403-scale-quality-of-canvas-control

3

If this is on OSX… by default (under Cocoa) it anti-aliases the resize giving fuzzy results

  #If TargetMacOS Then
    // provided by Sam Rowlands
    const kCGInterpolationNone = 1
    Declare Sub CGContextSetInterpolationQuality Lib "Cocoa" ( context As Integer, quality As Integer )
    //
    CGContextSetInterpolationQuality( g.handle( g.HandleTypeCGContextRef ), kCGInterpolationNone )
    //
  #EndIf
  
  g.drawpicture p,x,y,w1,h1,sx,sy,w2,h2

this worked for me

4

This was on OS X.

Thank you for your answers.

The problem using Declare for one plaform is the lack of Declare for the other platforms. :slight_smile:

The other problem is that happens only once or two times on a working day (less than ten when I was doing 2000 AD Comic Books).

At last, Preview (the free application in OS X) do it fine all the time. I may have to check how AppleScript goes with it (to automate the process)