LM3S9B96 图片转换成数组

Study_Stellaris

LM3S9B96 图片转换成数组 [复制链接]

有网友问到 LM3S9B96 图片转换成数组的方法。找到一个文档，大家可以试试。

This program converts an image in NetPBM format into a C structure definition

for a tImage that can be passed to the GrImageDraw() function.  Only the binary

PPM format (indicated by format code "P6") is supported by the program.

The NetPBM (http://netpbm.sourceforge.net) or ImageMagick

(http://www.imagemagick.org) packages may be used to convert image from other

formats (such as PNG, JPEG, or BMP) to a PPM.  They may also be used to scale

the image and reduce the number of colors as required by the application.

Using NetPBM as an example, given an image foo.jpg, the following steps are

used to convert it to something usable by the GrImageDraw() function:

1) "jpegtopnm foo.jpg > foo.pnm"

   This step converts the JPEG to a PNM, preparing it for further processing by

   the NetPBM tools.  Alternatively "bmptopnm", "pngtopnm", or "giftopnm" (or

   many others) can be used to convert other image formats to a PNM.  If

   starting from a PNM that is not in the required format, "pnmtopnm" will

   convert the file to the required PPM format.

2) "pamscale -width 64 -height 48 foo.pnm > foo_sm.pnm"

   Scale the image to 64 pixels wide by 48 pixels tall.  This is an optional

   step that is not needed if the image is already the required size.

3) "pnmcolormap 16 foo_sm.pnm > foo_cm.pnm"

   Produces a colormap of the 16 colors that can be used to best represent the

   color content in the image.  This colormap is used in the next step to

   reduce the amount of color content in the image.  If the image was

   constructed with the correct number of colors from the start, then this step

   (and the next) can be skipped.

   Changing the first argument (16 in this example) will change the number of

   colors in the colormap.  More colors provides better image color quality (in

   very colorful images) at the cost of more storage.  Note that 256 is the

   maximum number of colors that can be utilized by GrImageDraw().

4) "pnmremap -mapfile=foo_cm.pnm foo_sm.pnm > foo_img.pnm"

   Use the colormap produced in step 3 and set each pixel of the image to be

   the closest color in the colormap to the original pixel.  After this

   mapping, the image will only have the number of colors selected in the

   colormap.

5) "pnmtoc -c foo_img.pnm > foo.c"

   Convert the resulting PNM to a C array in foo.c, using compression.  The

   resulting file provides a structure definition for "g_sImage", which will

   likely require hand editing to be a more indicative name (and avoid a name

   clash if more than one image is used).

6) "ppmtobmp foo_img.pnm > foo_test.bmp"

   Convert the final PNM to a BMP for local examination.  Viewing the resulting

   image (after scaling and color reduction) on a PC will usually be quicker

   and easier, making it faster to try a variety of sizes and colormap sizes

   until an image of acceptable quality is produced.  This step is optional,

   though.

Any number of open source and commercial image manipulation program can perform

the equivalent operations (and even more sophisticated operations).

fish001

谢谢楼主分享 呵呵

Study_Stellaris

大家如果找到了 NetPBM  这个工具，可以传上来共享一下。

[ 本帖最后由 Study_Stellaris 于 2012-2-14 10:19 编辑 ]

鸵鸟蝈蝈

可以用GIMP将PNG文件转换成PNM，然后通过pnmtoc工具，导出数组。

ddllxxrr

allan0508

能翻译成中文吗

shanwei

我是用"bmptopnm",命令把bmp格式的图片转成pnm的，然后用用pamscale缩放到240×320像数，然后直接用TI的工具pnmtoc显示“Image contains too many colors”，然后用pnmcolormap生成128色的pnm，但是老是出错，不管是生成64色，128色，256色都出现错误，这个是什么原因啊