Re^3: Tk not recognising GD image

But I have more interesting things to investigate

The error arises in pTk/mTk/generic/tkImgPhoto.c:

  if (formatPtr == NULL) {
    ... code that might avoid the error by
    break()ing from the enclosing for() loop
  }
  if (formatPtr == NULL) {
      if ((formatObj != NULL) && !matched) {
           Tcl_AppendResult(interp, "image format \"", formatString,
                "\" is not supported", (char *) NULL);
      } else {
           Tcl_AppendResult(interp, "couldn't recognize image data",
               (char *) NULL);
      }
      return TCL_ERROR;
  }
[download]

So ... there are cases where (formatPtr == NULL) is not necessarily an error.
Perhaps yours should be one such case, but it's currently being undetected ? (I've no idea.)

Anyway .... just a starting point for you once the "more interesting things" have been investigated ;-)

Cheers,
Rob

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Re^4: Tk not recognising GD image -- further doubts by Discipulus (Canon) on May 09, 2022 at 08:52 UTC
Hello, a doubt still remains: I confirm this behaviour (and it sounds strange): > This code works when used on a file smaller than the screen. On a larger file, it fails .. Why it works for smaller files and need to be encoded for larger ones? L* There are no rules, there are no thumbs.. Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.	[reply] [d/l]
Re^5: Tk not recognising GD image -- further doubts by davies (Monsignor) on May 09, 2022 at 09:09 UTC
`$imtk = $mw->Photo(-data => $imgd->jpeg(), -format => 'jpeg'); } else { $imtk = $mw->Photo(-file => $file, -format => 'jpeg');` [download] The command is different, using the file directly via the `file` option rather than `data`. Larger files have to be resized to fit. I was thinking of using a temporary file as a workaround. Regards, John Davies	[reply] [d/l] [select]
Re^6: Tk not recognising GD image -- further doubts by Discipulus (Canon) on May 09, 2022 at 09:19 UTC
AH! I'm smarter sathurday night than monday in the morning :) L* There are no rules, there are no thumbs.. Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.	[reply] [d/l]