重复旋转 - 在导出到PNG时增加图像尺寸

我希望用户绘制一些东西。我将多次旋转该图像，并将每个文件保存到一个文件夹中。模板是img<degree>.png，例如img24.png是旋转24度的原始图像。这就像使用Rotate tool，将其设置为24度并使用默认坐标导出它。重复旋转 - 在导出到PNG时增加图像尺寸

问题是，我每次旋转并导出到PNG文件越来越大。当原始文件是100x100 & 380B时，第9个文件是413x412 2,47KB。我希望图像保持相同的大小（在上例中为100x100）。

(define (degrees-to-radians degrees) (/ (* degrees *pi*) 180)) 
(define (script-fu-rotate-and-save in-image in-drawable directory-name) ; degree) 

    (let ((ind 0) (x 0) (y 0)) 
    (while (< ind 361) 
     (set! x (car (gimp-image-width in-image))) 
     (set! y (car (gimp-image-height in-image))) 
     (gimp-item-transform-rotate in-drawable (degrees-to-radians ind) FALSE (/ x 2) (/ y 2)) 
     (file-png-save-defaults 1 in-image in-drawable (string-append directory-name "/img" (number->string ind) ".png") (string-append directory-name "/temp.png")) 
     (set! ind (+ ind 45)) 
    ) 
) 
    ;(gimp-displays-flush) ; show changes on image 
) 
(script-fu-register 
    "script-fu-rotate-and-save" ;name 
    "rotate and save" 
    "Rotates and saves" 
    "me" 
    "copyrights" 
    "today" 
    "" 
    SF-IMAGE "image-main" 0 
    SF-DRAWABLE "drawable-main" 0 
    SF-DIRNAME "directory-name" "" 
    ;SF-ADJUSTMENT "label" '(value lower upper step_inc page_inc digits type) 
    ;SF-ADJUSTMENT "degree" '(1 1 360 1 1 0 0) 
) 
(script-fu-menu-register "script-fu-rotate-and-save" "<Image>/Rotate and save")

来源

2016-10-02 Darek Nędza