[Part I. GIMP基礎功]

[Part II. 一種效果的誕生]
[Part III. Script-Fu的秘密]

8.13 藍光結冰字的 Python code

本節的內容相當於是「17.4 結冰字」 的 Python code

將藍光結冰效果作用在字體的外圍,或物體輪廓的剪影
  • 我利用 if 條件敘述,讓本節與下一節的程式碼相同
    • ALPHA_TO_LOGO = FALSE ,表示對字體的外圍,施加藍光結冰效果
    • ALPHA_TO_LOGO = TRUE ,表示對長頸鹿的外圍,施加藍光結冰效果


等價的 Python-Fu 程式碼
  • 下面的程式碼,可將藍光結冰的視效,添加在字體的外圍,也可以添加在圖案的外圍
  • ALPHA_TO_LOGO = FALSE ,表示對字體的外圍,施加藍光結冰效果
  • 下面的程式碼,分成六大部份:
    1. 首先,準備好新的影像、新的圖層。
    2. pdb.gimp_text_fontname(...) 寫上字樣 Text
    3. 白色雜點 Noisify + 閃光 Sparkle
    4. 弄糊灰階的閃光,調色,產生藍光結冰的感覺
    5. 漸層效果 + 立體效果(此部份用於藍光結冰的字體,省略不做)
    6. 調整圖層的結構,與顯示的順序
# Part 1.
# 決定 True or FALSE
# 決定是 ALPHA_TO_LOGO 或是 TEXT_EFFECT
#ALPHA_TO_LOGO = True
ALPHA_TO_LOGO = FALSE
TEXT_EFFECT = not ALPHA_TO_LOGO

black = (0, 0, 0)
white = (255, 255, 255)
red = (255, 0, 0)
yellow = (255, 255, 0)
ice_blue = (53, 216, 244)

if ALPHA_TO_LOGO:
file_uri = "https://lh5.googleusercontent.com/-S0CTFq_z05Y/Tx4p8wa75UI/AAAAAAAAFo8/pN4FxCwxKnY/s512/lemmling_Cartoon_giraffe.png"
img = pdb.file_uri_load(file_uri, file_uri)
drw_backup = pdb.gimp_image_get_active_layer(img)
pdb.gimp_drawable_set_name(drw_backup, "Giraffe Original")
# 長頸鹿的圖案決定了圖片的尺寸
width = pdb.gimp_image_width(img)
height = pdb.gimp_image_height(img)

if TEXT_EFFECT:
# 直接決定圖片的尺寸
width = 256
height = 160
string = "ICE"
font_size = 72
#font = "Arial"
#font = "Sans"
font = "DejaVu Sans Bold"
text_ext = pdb.gimp_text_get_extents_fontname(string, font_size, PIXELS, font)
text_width = text_ext[0]
text_height= text_ext[1]
# 決定 ICE 字樣要放置的位置
text_offx = width/2 - text_width/2
text_offy = height/2 - text_height/2
img = pdb.gimp_image_new(width, height, RGB)

# ALPHA_TO_LOGO 與 TEXT_EFFECT 這一部份的程式碼相同
# 生成黑色的背景圖層
bg_layer = pdb.gimp_layer_new(img, width, height, RGB_IMAGE, "Background", 100, NORMAL_MODE)
pdb.gimp_image_add_layer(img, bg_layer, 0)
pdb.gimp_context_set_foreground(black)
pdb.gimp_edit_fill(bg_layer, FOREGROUND_FILL)
pdb.gimp_display_new(img)

# Part 2.
if ALPHA_TO_LOGO:
# 純色的長頸鹿的剪影
logo_backup = pdb.gimp_layer_copy(drw_backup, TRUE)
pdb.gimp_image_add_layer(img, logo_backup, -1)
pdb.gimp_drawable_set_name(logo_backup, "Logo Backup")
pdb.gimp_selection_layer_alpha(logo_backup)
pdb.gimp_context_set_foreground(black) # 填入黑色
pdb.gimp_edit_fill(logo_backup, FOREGROUND_FILL)
pdb.gimp_selection_none(img)

if TEXT_EFFECT:
# 對文字效果而言,純色的字體,其意義,等同於長頸鹿的剪影
# 因此,字體 就是 logo
logo_backup = pdb.gimp_layer_new(img, width, height, RGBA_IMAGE, "Text (Logo Backup)", 100, NORMAL_MODE)
pdb.gimp_image_add_layer(img, logo_backup, 0)
pdb.gimp_context_set_foreground(black)
tmp_layer = pdb.gimp_text_fontname(img, logo_backup, text_width, text_height ,string, 0, TRUE, font_size, PIXELS, font)
pdb.gimp_layer_set_offsets(tmp_layer, text_offx, text_offy)
pdb.gimp_floating_sel_anchor(tmp_layer)

# Part 3. 閃光 Sparkle
pdb.gimp_selection_layer_alpha(logo_backup)
pdb.plug_in_noisify(img, bg_layer, FALSE, 0.8, 0.8, 0.8, 0.8)
pdb.plug_in_noisify(img, bg_layer, FALSE, 0.8, 0.8, 0.8, 0.8)
pdb.gimp_selection_none(img)

lum_threshold = 0.019 #
flare_inten = 0.5
spike_len = 60 #
spike_pts = 4
spike_angle = 15
density = 1
transparency = 0
random_hue = 0
random_saturation = 0
preserve_luminosity = FALSE
inverse = FALSE
border = FALSE
color_type = 2 # BACKGROUND
pdb.gimp_context_set_background(white)
pdb.plug_in_sparkle(img, bg_layer, lum_threshold, flare_inten, spike_len, spike_pts, spike_angle, density, transparency, random_hue, random_saturation, preserve_luminosity, inverse, border, color_type)

# Part 4.
# 弄糊灰階的閃光

fuzzy_layer = pdb.gimp_layer_copy(logo_backup, TRUE)
pdb.gimp_image_add_layer(img, fuzzy_layer, -1)
pdb.gimp_drawable_set_name(fuzzy_layer, "Fuzzy")

blur_radius = 10
pdb.plug_in_gauss_iir(img, fuzzy_layer, blur_radius, 1, 1)

pdb.gimp_image_lower_layer(img, fuzzy_layer)
bg_layer = pdb.gimp_image_merge_down(img, fuzzy_layer, EXPAND_AS_NECESSARY)
pdb.gimp_drawable_set_name(bg_layer, "Background")

blur_radius = 1
pdb.plug_in_gauss_iir(img, bg_layer, blur_radius, 1, 1)
pdb.plug_in_gauss_iir(img, bg_layer, blur_radius, 1, 1)
pdb.plug_in_gauss_iir(img, bg_layer, blur_radius, 1, 1)

# 調色產生藍光結冰的感覺
pdb.gimp_color_balance(bg_layer, 0, TRUE, 0, 0, 100)
pdb.gimp_color_balance(bg_layer, 1, TRUE, 0, 0, 100)
pdb.gimp_color_balance(bg_layer, 2, TRUE, 0, 100, 100)

# Part 5.
# 漸層效果 + 立體效果
if TEXT_EFFECT:
pdb.gimp_layer_set_visible(logo_backup, TRUE)
logo_layer = pdb.gimp_layer_copy(logo_backup, TRUE)
pdb.gimp_image_add_layer(img, logo_layer, -1)
pdb.gimp_drawable_set_name(logo_layer, "Gradient Effect Logo")
pdb.gimp_layer_set_lock_alpha(logo_layer, TRUE)
pdb.gimp_context_set_foreground(ice_blue )
pdb.gimp_context_set_background(white)
offset =0 ;repeat = REPEAT_TRIANGULAR;reverse = FALSE;
supersample = FALSE ; max_depth = 0 ; threshold = 0;
dither = TRUE ;
x1 = text_offx; y1 = text_offy; x2 = text_offx + 10; y2 = text_offy +10 # 相當於由字的左上角往右下拉一小段直線
pdb.gimp_blend(logo_layer, FG_BG_RGB_MODE, NORMAL_MODE, GRADIENT_LINEAR, 100, offset, repeat, reverse, supersample, max_depth, threshold, dither, x1, y1, x2, y2)
#
pdb.plug_in_bump_map(img, logo_layer, logo_layer, 135.0, 35, 3, 0, 0, 0, 0, TRUE, FALSE, 0)

# Part 6.
# 調整圖層的結構,與顯示的順序
# 讓「藍光結冰效果 」烘托「長頸鹿」圖案
# 或烘托「漸層的 ICE」字樣
if ALPHA_TO_LOGO:
pdb.gimp_image_raise_layer_to_top(img, drw_backup)
pdb.gimp_layer_set_visible(logo_backup, FALSE)

if TEXT_EFFECT:
pdb.gimp_layer_set_visible(logo_backup, FALSE)
  • 啟動 GIMP Python Console
  • 將前面的程式碼,依次序,全部選取、複製、再貼到 Python Console 提示符號 >>> 之後,按下 Enter 。
  • 過一會,就會看到藍光效果,與其圖層結構,如下圖所示。


spike_len = 30


spike_len = 60