Added grayscale flag

README.md

@@ -188,6 +188,16 @@ ascii-image-converter [image paths/urls] -m " .-=+#@"
   <img src="https://raw.githubusercontent.com/TheZoraiz/ascii-image-converter/master/example_gifs/map.gif">
 </p>
 
+#### --grayscale OR -g
+
+Display ascii art in grayscale colors. This is the same as --color flag, except each character will be encoded with a grayscale RGB value.
+
+```
+ascii-image-converter [image paths/urls] -g
+# Or
+ascii-image-converter [image paths/urls] --grayscale
+```
+
 #### --negative OR -n
 
 Display ascii art in negative colors. Works with both uncolored and colored text from --color flag.
@@ -327,11 +337,12 @@ func main() {
 	flags.SaveImagePath = "."  // Save generated PNG image in same directory
 	flags.SaveGifPath = "." // If gif was provided, save ascii art gif in same directory
 	flags.Negative = true  // Ascii art will have negative color-depth
-	flags.Colored = true  // Keep colors from original image
-	flags.CustomMap = " .-=+#@"  // Starting from darkest to brightest shades. This overrites "complex" flag
+	flags.Colored = true  // Keep colors from original image. This overrides flags.Grayscale
+	flags.Grayscale = true // Returns grayscale ascii art
+	flags.CustomMap = " .-=+#@"  // Starting from darkest to brightest shades. This overrides flags.Complex
 	flags.FlipX = true  // Flips ascii art horizontally
 	flags.FlipY = true  // Flips ascii art vertically
-	flags.Full = true  // Display ascii art that fills the terminal width
+	flags.Full = true  // Display ascii art that fills the terminal width. This overrides flags.Dimensions
 
 	// For an image
 	asciiArt, err := aic_package.Convert(filePath, flags)

aic_package/convert_gif.go

@@ -107,7 +107,7 @@ func pathIsGif(gifPath, urlImgName string, pathIsURl bool, urlImgBytes []byte, l
 			gifFramesSlice[i].asciiCharSet = asciiCharSet
 			gifFramesSlice[i].delay = originalGif.Delay[i]
 
-			ascii := flattenAscii(asciiCharSet, colored)
+			ascii := flattenAscii(asciiCharSet, colored || grayscale)
 
 			asciiArtSet[i] = strings.Join(ascii, "\n")
 
@@ -179,7 +179,7 @@ func pathIsGif(gifPath, urlImgName string, pathIsURl bool, urlImgBytes []byte, l
 				tempImg, err := createGifFrameToSave(
 					gifFrame.asciiCharSet,
 					img,
-					colored,
+					colored || grayscale,
 				)
 				if err != nil {
 					fmt.Println(err)

aic_package/convert_image.go

@@ -56,7 +56,7 @@ func pathIsImage(imagePath, urlImgName string, pathIsURl bool, urlImgBytes []byt
 	if saveImagePath != "" {
 		if err := createImageToSave(
 			asciiSet,
-			colored,
+			colored || grayscale,
 			saveImagePath,
 			imagePath,
 			urlImgName,
@@ -79,7 +79,7 @@ func pathIsImage(imagePath, urlImgName string, pathIsURl bool, urlImgBytes []byt
 		}
 	}
 
-	ascii := flattenAscii(asciiSet, colored)
+	ascii := flattenAscii(asciiSet, colored || grayscale)
 	result := strings.Join(ascii, "\n")
 
 	return result, nil

aic_package/convert_root.go

@@ -43,6 +43,7 @@ type Flags struct {
 	SaveGifPath   string
 	Negative      bool
 	Colored       bool
+	Grayscale     bool
 	CustomMap     string
 	FlipX         bool
 	FlipY         bool
@@ -55,6 +56,7 @@ var (
 	saveTxtPath   string
 	saveImagePath string
 	saveGifPath   string
+	grayscale     bool
 	negative      bool
 	colored       bool
 	customMap     string
@@ -74,6 +76,7 @@ func DefaultFlags() Flags {
 		SaveGifPath:   "",
 		Negative:      false,
 		Colored:       false,
+		Grayscale:     false,
 		CustomMap:     "",
 		FlipX:         false,
 		FlipY:         false,
@@ -96,6 +99,7 @@ The "flags" argument should be declared as follows before passing:
 	SaveGifPath : string, // System path to save the ascii art gif as a .gif  file. Pass "" to ignore
  	Negative: bool, // Pass true for negative color-depth ascii art
  	Colored: bool, // Pass true for returning colored ascii string
+	Grayscale: bool // Pass true for returning grayscale ascii string
  	CustomMap: string, // Custom map of ascii chars e.g. " .-+#@" . Nullifies "complex" flag. Pass "" to ignore.
  	FlipX: bool, // Pass true to return horizontally flipped ascii art
  	FlipY: bool, // Pass true to return vertically flipped ascii art
@@ -115,6 +119,7 @@ func Convert(filePath string, flags Flags) (string, error) {
 	saveGifPath = flags.SaveGifPath
 	negative = flags.Negative
 	colored = flags.Colored
+	grayscale = flags.Grayscale
 	customMap = flags.CustomMap
 	flipX = flags.FlipX
 	flipY = flags.FlipY

aic_package/create_ascii_image.go

@@ -27,10 +27,17 @@ import (
 	"github.com/golang/freetype/truetype"
 )
 
-// To embed font directly into the binary, instead of packaging it as a separate file
 //go:embed RobotoMono-Bold.ttf
 var embeddedFontFile []byte
 
+var tempFont *truetype.Font
+
+// Load embedded font
+func init() {
+	// Error not handled because the same font file will always be used
+	tempFont, _ = truetype.Parse(embeddedFontFile)
+}
+
 /*
 Unlike createGifFrameToSave(), this function is altered to ignore execution time and has a fixed font size.
 This creates maximum quality ascii art, although the resulting image will not have the same dimensions
@@ -69,13 +76,7 @@ func createImageToSave(asciiArt [][]imgManip.AsciiChar, colored bool, saveImageP
 
 	dc.DrawImage(tempImg, 0, 0)
 
-	// Load embedded font
-	tempFont, err := truetype.Parse(embeddedFontFile)
-	if err != nil {
-		return err
-	}
 	robotoBoldFontFace := truetype.NewFace(tempFont, &truetype.Options{Size: constant * 1.5})
-
 	dc.SetFontFace(robotoBoldFontFace)
 
 	// Font color of text on picture is white by default
@@ -98,7 +99,7 @@ func createImageToSave(asciiArt [][]imgManip.AsciiChar, colored bool, saveImageP
 			b := uint8(char.RgbValue[2])
 
 			if colored {
-				// Simple put, dc.SetColor() sets color for EACH character before printing it
+				// Simply put, dc.SetColor() sets color for EACH character before printing it
 				dc.SetColor(color.RGBA{r, g, b, 255})
 			}
 

cmd/root.go

@@ -39,6 +39,7 @@ var (
 	negative      bool
 	formatsTrue   bool
 	colored       bool
+	grayscale     bool
 	customMap     string
 	flipX         bool
 	flipY         bool
@@ -48,7 +49,7 @@ var (
 	rootCmd = &cobra.Command{
 		Use:     "ascii-image-converter [image paths/urls]",
 		Short:   "Converts images and gifs into ascii art",
-		Version: "1.4.0",
+		Version: "1.4.1",
 		Long:    "This tool converts images into ascii art and prints them on the terminal.\nFurther configuration can be managed with flags.",
 
 		// Not RunE since help text is getting larger and seeing it for every error impacts user experience
@@ -66,6 +67,7 @@ var (
 				SaveGifPath:   saveGifPath,
 				Negative:      negative,
 				Colored:       colored,
+				Grayscale:     grayscale,
 				CustomMap:     customMap,
 				FlipX:         flipX,
 				FlipY:         flipY,
@@ -185,12 +187,13 @@ func init() {
 	rootCmd.Flags().SortFlags = false
 
 	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.ascii-image-converter.yaml)")
-	rootCmd.PersistentFlags().BoolVarP(&colored, "color", "C", false, "Display ascii art with original colors\n(Can work with the --negative flag)\n")
+	rootCmd.PersistentFlags().BoolVarP(&colored, "color", "C", false, "Display ascii art with original colors\n(Can work with the --negative flag)\n(Overrides --grayscale flag)\n")
 	rootCmd.PersistentFlags().IntSliceVarP(&dimensions, "dimensions", "d", nil, "Set width and height for ascii art in CHARACTER length\ne.g. -d 60,30 (defaults to terminal height)\n")
-	rootCmd.PersistentFlags().StringVarP(&customMap, "map", "m", "", "Give custom ascii characters to map against\nOrdered from darkest to lightest\ne.g. -m \" .-+#@\" (Quotation marks excluded from map)\n(Cancels --complex flag)\n")
+	rootCmd.PersistentFlags().StringVarP(&customMap, "map", "m", "", "Give custom ascii characters to map against\nOrdered from darkest to lightest\ne.g. -m \" .-+#@\" (Quotation marks excluded from map)\n(Overrides --complex flag)\n")
+	rootCmd.PersistentFlags().BoolVarP(&grayscale, "grayscale", "g", false, "Display grayscale ascii art\n(Can work with --negative flag)\n")
 	rootCmd.PersistentFlags().BoolVarP(&complex, "complex", "c", false, "Display ascii characters in a larger range\nMay result in higher quality\n")
-	rootCmd.PersistentFlags().BoolVarP(&full, "full", "f", false, "Use largest dimensions for ascii art that\nfill the terminal width\n(Cancels --dimensions flag)\n")
-	rootCmd.PersistentFlags().BoolVarP(&negative, "negative", "n", false, "Display ascii art in negative colors\n(Can work with the --color flag)\n")
+	rootCmd.PersistentFlags().BoolVarP(&full, "full", "f", false, "Use largest dimensions for ascii art that\nfill the terminal width\n(Overrides --dimensions flag)\n")
+	rootCmd.PersistentFlags().BoolVarP(&negative, "negative", "n", false, "Display ascii art in negative colors\n")
 	rootCmd.PersistentFlags().BoolVarP(&flipX, "flipX", "x", false, "Flip ascii art horizontally\n")
 	rootCmd.PersistentFlags().BoolVarP(&flipY, "flipY", "y", false, "Flip ascii art vertically\n")
 	rootCmd.PersistentFlags().StringVarP(&saveImagePath, "save-img", "s", "", "Save ascii art as a .png file\nFormat: <image-name>-ascii-art.png\nImage will be saved in passed path\n(pass . for current directory)\n")

image_manipulation/ascii_conversions.go

@@ -110,12 +110,12 @@ var asciiTableDetailed = map[int]string{
 }
 
 // For each individual element of imgSet in ConvertToASCIISlice()
-const MAX_VAL float32 = 65535
+const MAX_VAL float64 = 65535
 
 type AsciiChar struct {
 	Colored  string
 	Simple   string
-	RgbValue []uint32
+	RgbValue [3]uint32
 }
 
 // Converts the 2D AsciiPixel slice of image data (each instance representing each pixel of original image)
@@ -124,7 +124,7 @@ type AsciiChar struct {
 //
 // If complex parameter is true, values are compared to 69 levels of color density in ASCII characters.
 // Otherwise, values are compared to 10 levels of color density in ASCII characters.
-func ConvertToAscii(imgSet [][]AsciiPixel, negative bool, colored bool, complex bool, customMap string) [][]AsciiChar {
+func ConvertToAscii(imgSet [][]AsciiPixel, negative, colored, complex bool, customMap string) [][]AsciiChar {
 
 	height := len(imgSet)
 	width := len(imgSet[0])
@@ -155,18 +155,26 @@ func ConvertToAscii(imgSet [][]AsciiPixel, negative bool, colored bool, complex
 		var tempSlice []AsciiChar
 
 		for j := 0; j < width; j++ {
-			value := float32(imgSet[i][j].grayscaleValue)
+			value := float64(imgSet[i][j].charDepth)
 
 			// Gets appropriate string index from asciiTableSimple by percentage comparisons with its length
-			tempFloat := (value / MAX_VAL) * float32(len(chosenTable))
+			tempFloat := (value / MAX_VAL) * float64(len(chosenTable))
 			if value == MAX_VAL {
-				tempFloat = float32(len(chosenTable) - 1)
+				tempFloat = float64(len(chosenTable) - 1)
 			}
 			tempInt := int(tempFloat)
 
-			r := int(imgSet[i][j].rgbValue[0])
-			g := int(imgSet[i][j].rgbValue[1])
-			b := int(imgSet[i][j].rgbValue[2])
+			var r, g, b int
+
+			if colored {
+				r = int(imgSet[i][j].rgbValue[0])
+				g = int(imgSet[i][j].rgbValue[1])
+				b = int(imgSet[i][j].rgbValue[2])
+			} else {
+				r = int(imgSet[i][j].grayscaleValue[0])
+				g = int(imgSet[i][j].grayscaleValue[1])
+				b = int(imgSet[i][j].grayscaleValue[2])
+			}
 
 			if negative {
 				// Select character from opposite side of table as well as turn pixels negative
@@ -175,7 +183,11 @@ func ConvertToAscii(imgSet [][]AsciiPixel, negative bool, colored bool, complex
 				b = 255 - b
 
 				// To preserve negative rgb values for saving png image later down the line, since it uses imgSet
-				imgSet[i][j].rgbValue = []uint32{uint32(r), uint32(g), uint32(b)}
+				if colored {
+					imgSet[i][j].rgbValue = [3]uint32{uint32(r), uint32(g), uint32(b)}
+				} else {
+					imgSet[i][j].grayscaleValue = [3]uint32{uint32(r), uint32(g), uint32(b)}
+				}
 
 				tempInt = (len(chosenTable) - 1) - tempInt
 			}
@@ -189,7 +201,11 @@ func ConvertToAscii(imgSet [][]AsciiPixel, negative bool, colored bool, complex
 			char.Colored = color.Sprintf("<fg="+rStr+","+gStr+","+bStr+">%v</>", chosenTable[tempInt])
 			char.Simple = chosenTable[tempInt]
 
-			char.RgbValue = imgSet[i][j].rgbValue
+			if colored {
+				char.RgbValue = imgSet[i][j].rgbValue
+			} else {
+				char.RgbValue = imgSet[i][j].grayscaleValue
+			}
 
 			tempSlice = append(tempSlice, char)
 		}

image_manipulation/image_conversions.go

@@ -26,8 +26,9 @@ import (
 )
 
 type AsciiPixel struct {
-	grayscaleValue uint32
-	rgbValue       []uint32
+	charDepth      uint32
+	grayscaleValue [3]uint32
+	rgbValue       [3]uint32
 }
 
 // This function shrinks the passed image according to passed dimensions or terminal
@@ -120,20 +121,25 @@ func ConvertToAsciiPixels(img image.Image, dimensions []int, flipX, flipY, full
 		for x := b.Min.X; x < b.Max.X; x++ {
 
 			oldPixel := smallImg.At(x, y)
-			pixel := color.GrayModel.Convert(oldPixel)
+			grayPixel := color.GrayModel.Convert(oldPixel)
 
 			// We only need Red from Red, Green, Blue (RGB) for grayscaleValue in AsciiPixel since they have the same value for grayscale images
-			r1, _, _, _ := pixel.RGBA()
+			r1, g1, b1, _ := grayPixel.RGBA()
+			charDepth := r1
+			r1 = uint32(r1 / 257)
+			g1 = uint32(g1 / 257)
+			b1 = uint32(b1 / 257)
 
-			// Get colored RGB values of original pixel for rgbValue in AsciiPixel
+			// Get co1ored RGB values of original pixel for rgbValue in AsciiPixel
 			r2, g2, b2, _ := oldPixel.RGBA()
 			r2 = uint32(r2 / 257)
 			g2 = uint32(g2 / 257)
 			b2 = uint32(b2 / 257)
 
 			temp = append(temp, AsciiPixel{
-				grayscaleValue: r1,
-				rgbValue:       []uint32{r2, g2, b2},
+				charDepth:      charDepth,
+				grayscaleValue: [3]uint32{r1, g1, b1},
+				rgbValue:       [3]uint32{r2, g2, b2},
 			})
 
 		}
@@ -166,7 +172,3 @@ func reverse(imgSet [][]AsciiPixel, flipX, flipY bool) [][]AsciiPixel {
 
 	return imgSet
 }
-
-func calculateDimensions() {
-
-}

snapcraft.yaml

@@ -1,7 +1,7 @@
 name: ascii-image-converter
 base: core18 
-version: "1.4.0"
-summary: Converts images and gifs into ascii art
+version: "1.4.1"
+summary: Convert images and gifs into ascii art
 description: |
   This tool converts images and gifs into ascii format and prints them onto the terminal window.
   Supported input formats are JPEG/JPG, PNG, WEBP, BMP TIFF/TIF and GIF. Further configuration can be managed by flags.